# Calculator De Moivre's theorem

There are 4 solutions, due to “The Fundamental Theorem of Algebra”. Your expression contains roots of complex numbers or powers to 1/n.

*z*_{1} = (1^(1/4)) = 1 Calculation steps

_{1}

- Divide: 1 / 4 = 0.25
- Exponentiation: 1 ^ the result of step No. 1 = 1 ^ 0.25 = 1

*z*_{2} = (1^(1/4)) = i = **e**^{i π/2} Calculation steps principal root

_{2}

- Divide: 1 / 4 = 0.25
- Exponentiation: 1 ^ the result of step No. 1 = 1 ^ 0.25 =
**i**

The result

*z*_{2}**Rectangular form:**

*z*=

**i**

**Angle notation (phasor):**

*z*= 1 ∠ 90°

**Polar form:**

*z*= cos 90° +

**i**sin 90°

**Exponential form:**

*z*=

**e**

^{i 1.5707963}=

**e**

^{i π/2}

**Polar coordinates:**

r = |

*z*| = 1 ... magnitude (modulus, absolute value)

θ = arg

*z*= 1.5707963 rad = 90° = 0.5π = π/2 rad ... angle (argument or phase)

**Cartesian coordinates:**

Cartesian form of imaginary number:

*z*=

**i**

Real part: x = Re

*z*= 0

Imaginary part: y = Im

*z*= 1

*z*_{3} = (1^(1/4)) = -1 Calculation steps

_{3}

- Divide: 1 / 4 = 0.25
- Exponentiation: 1 ^ the result of step No. 1 = 1 ^ 0.25 = -1

The result

*z*_{2}**Rectangular form:**

*z*=

**i**

**Angle notation (phasor):**

*z*= 1 ∠ 90°

**Polar form:**

*z*= cos 90° +

**i**sin 90°

**Exponential form:**

*z*=

**e**

^{i 1.5707963}=

**e**

^{i π/2}

**Polar coordinates:**

r = |

*z*| = 1 ... magnitude (modulus, absolute value)

θ = arg

*z*= 1.5707963 rad = 90° = 0.5π = π/2 rad ... angle (argument or phase)

**Cartesian coordinates:**

Cartesian form of imaginary number:

*z*=

**i**

Real part: x = Re

*z*= 0

Imaginary part: y = Im

*z*= 1

*z*_{4} = (1^(1/4)) = -i = **e**^{i (-π/2)} Calculation steps

_{4}

- Divide: 1 / 4 = 0.25
- Exponentiation: 1 ^ the result of step No. 1 = 1 ^ 0.25 = -
**i**

The result

*z*_{4}**Rectangular form:**

*z*= -

**i**

**Angle notation (phasor):**

*z*= 1 ∠ -90°

**Polar form:**

*z*= cos (-90°) +

**i**sin (-90°)

**Exponential form:**

*z*=

**e**

^{i -1.5707963}=

**e**

^{i (-π/2)}

**Polar coordinates:**

r = |

*z*| = 1 ... magnitude (modulus, absolute value)

θ = arg

*z*= -1.5707963 rad = -90° = -0.5π = -π/2 rad ... angle (argument or phase)

**Cartesian coordinates:**

Cartesian form of imaginary number:

*z*= -

**i**

Real part: x = Re

*z*= 0

Imaginary part: y = Im

*z*= -1

This calculator does basic arithmetic on complex numbers and evaluates expressions in the set of complex numbers.
As an imaginary unit, use

Complex numbers in the angle notation or phasor (

Example of multiplication of two imaginary numbers in the angle/polar/phasor notation: 10L45 * 3L90.

For use in education (for example, calculations of alternating currents at high school), you need a quick and precise complex number calculator.

**i**or**j**(in electrical engineering), which satisfies the basic equation**i**or^{2}= −1**j**. The calculator also converts a complex number into angle notation (phasor notation), exponential, or polar coordinates (magnitude and angle). Enter expression with complex numbers like 5*(1+i)(-2-5i)^2^{2}= −1Complex numbers in the angle notation or phasor (

**polar coordinates**r, θ) may you write as**rLθ**where**r**is magnitude/amplitude/radius, and**θ**is the angle (phase) in degrees, for example, 5L65 which is the same as 5*cis(65°).Example of multiplication of two imaginary numbers in the angle/polar/phasor notation: 10L45 * 3L90.

For use in education (for example, calculations of alternating currents at high school), you need a quick and precise complex number calculator.

## Basic operations with complex numbers

We hope that work with the complex number is quite easy because you can work with imaginary unit**i**as a variable. And use definition

**i**to simplify complex expressions. Many operations are the same as operations with two-dimensional vectors.

^{2}= -1### Addition

Very simple, add up the real parts (without i) and add up the imaginary parts (with i):This is equal to use rule: (a+b

**i**)+(c+d

**i**) = (a+c) + (b+d)

**i**

(1+i) + (6-5i) = 7-4

**i**

12 + 6-5i = 18-5

**i**

(10-5i) + (-5+5i) = 5

### Subtraction

Again very simple, subtract the real parts and subtract the imaginary parts (with i):This is equal to use rule: (a+b

**i**)+(c+d

**i**) = (a-c) + (b-d)

**i**

(1+i) - (3-5i) = -2+6

**i**

-1/2 - (6-5i) = -6.5+5

**i**

(10-5i) - (-5+5i) = 15-10

**i**

### Multiplication

To multiply two complex numbers, use distributive law, avoid binomials, and apply**i**.

^{2}= -1This is equal to use rule: (a+b

**i**)(c+d

**i**) = (ac-bd) + (ad+bc)

**i**

(1+i) (3+5i) = 1*3+1*5i+i*3+i*5i = 3+5i+3i-5 = -2+8

**i**

-1/2 * (6-5i) = -3+2.5

**i**

(10-5i) * (-5+5i) = -25+75

**i**

### Division

The division of two complex numbers can be accomplished by multiplying the numerator and denominator by the denominator's complex conjugate. This approach avoids imaginary unit**i**from the denominator. If the denominator is c+d

**i**, to make it without i (or make it real), multiply with conjugate c-d

**i**:

(c+d

**i**)(c-d

**i**) = c

^{2}+d

^{2}

$\frac{a+bi}{c+di}}={\displaystyle \frac{(a+bi)(c-di)}{(c+di)(c-di)}}={\displaystyle \frac{ac+bd+i(bc-ad)}{{c}^{2}+{d}^{2}}}={\displaystyle \frac{ac+bd}{{c}^{2}+{d}^{2}}}+{\displaystyle \frac{bc-ad}{{c}^{2}+{d}^{2}}}i$

(10-5i) / (1+i) = 2.5-7.5

**i**

-3 / (2-i) = -1.2-0.6

**i**

6i / (4+3i) = 0.72+0.96

**i**

### Absolute value or modulus

The absolute value or modulus is the distance of the image of a complex number from the origin in the plane. The calculator uses the Pythagorean theorem to find this distance. Very simple, see examples: |3+4i| = 5|1-i| = 1.4142136

|6i| = 6

abs(2+5i) = 5.3851648

### Square root

Square root of complex number (a+bi) is z, if z^{2}= (a+bi). Here ends simplicity. Because of the fundamental theorem of algebra, you will always have two different square roots for a given number. If you want to find out the possible values, the easiest way is to go with De Moivre's formula. Our calculator is on edge because the square root is not a well-defined function on a complex number. We calculate all complex roots from any number - even in expressions:

sqrt(9i) = 2.1213203+2.1213203

**i**

sqrt(10-6i) = 3.2910412-0.9115656

**i**

pow(-32,1/5)/5 = -0.4

pow(1+2i,1/3)*sqrt(4) = 2.439233+0.9434225

**i**

pow(-5i,1/8)*pow(8,1/3) = 2.3986959-0.4771303

**i**

### Square, power, complex exponentiation

Our calculator can power any complex number to an integer (positive, negative), real, or even complex number. In other words, we calculate 'complex number to a complex power' or 'complex number raised to a power'...Famous example:

${i}^{i}={e}^{-\pi \mathrm{/}2}$

i^2 = -1i^61 =

**i**

(6-2i)^6 = -22528-59904

**i**

(6-i)^4.5 = 2486.1377428-2284.5557378

**i**

(6-5i)^(-3+32i) = 2929449.03994-9022199.58262

**i**

i^i = 0.2078795764

pow(1+i,3) = -2+2

**i**

### Functions

- sqrt
- Square Root of a value or expression.
- sin
- the sine of a value or expression. Autodetect radians/degrees.
- cos
- the cosine of a value or expression. Autodetect radians/degrees.
- tan
- tangent of a value or expression. Autodetect radians/degrees.
- exp
- e (the Euler Constant) raised to the power of a value or expression
- pow
- Power one complex number to another integer/real/complex number
- ln
- The natural logarithm of a value or expression
- log
- The base-10 logarithm of a value or expression
- abs or |1+i|
- The absolute value of a value or expression
- phase
- Phase (angle) of a complex number
- cis
- is less known notation: cis(x) = cos(x)+ i sin(x); example: cis (pi/2) + 3 = 3+
**i** - conj
- conjugate of complex number - example: conj(4i+5) = 5-4
**i**

## Complex numbers in word problems:

- ReIm notation

Let z = 6 + 5i and w = 3 - i. Compute the following and express your answer in a + bi form. w + 3z - Reciprocal

Calculate reciprocal of z=0.8-1.8i: - Subtracting complex in polar

Given w =√2(cosine (p/4) + i sine (pi/4) ) and z = 2 (cosine (pi/2) + i sine (pi/2) ), what is w - z expressed in polar form? - Eq2 equations

For each of the following problems, determine the roots of the equation. Given the roots, sketch the graph and explain how your sketch matches the roots given and the form of the equation: g(x)=36x^{2}-12x+5 h(x)=x^{2}-4x+20 f(x)=4x^{2}-24x+45 p(x)=9x^{2}-36x+40 - The modulus

Find the modulus of the complex number 2 + 5i - Conjugate equation

Find the numbers of a and b, if (a - bi) (3 + 5i) is the Conjugate of (-6 - 24i) - Two grandmothers

Two grandmothers went to sell eggs at the market, and they had a total of 100. When they sold all the eggs, they made the same money. The first grandmother says to the second: "If I sold my eggs for your price, I would earn 15 crowns. " The other grandmot - Mistake in expression

While attempting to multiply the expression (2 - 5i)(5 + 2i) a student made a mistake. (2 - 5i)(5 + 2i) = 10 + 4i - 25i - 10i2 = 10 + 4(-1) - 25(-1) - 10(1) = 10 - 4 + 25 - 10 = 21 Complete the explanation and correct the error. Hint: The student inc - Let z1=x1+y1i

Let z1=x1+y1i and z2=x2+y2i Find: a = Im (z1z2) b = Re (z1/z2) - Complex number coordinates

Which coordinates show the location of -2+3i - De Moivre's formula

There are two distinct complex numbers z, such that z^{3}is equal to 1 and z is not equal to 1. Calculate the sum of these two numbers. - Evaluate 18

Evaluate the expression (-4-7i)-(-6-9i) and write the result in the form a+bi (Real + i* Imaginary). - An Argand diagram

Find the sum z1+z2 and difference z1-z2 and z2-z1 of z1=5+2i and z2=2+3i by an Argand diagram.

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