Trigonometry Examples

$\frac{(- 9 \sqrt{3} - 9 i) \cdot (9 - 9 \sqrt{3} i)}{(9 + 9 \sqrt{3} i) \cdot (9 + 9 \sqrt{3} i)}$

Step 1

Cancel the common factor of $- 9 \sqrt{3} - 9 i$ and $9 + 9 \sqrt{3} i$ .

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Step 1.1

Factor $9$ out of $(- 9 \sqrt{3} - 9 i) \cdot (9 - 9 \sqrt{3} i)$ .

$\frac{9 ((- \sqrt{3} - i) \cdot (9 - 9 \sqrt{3} i))}{(9 + 9 \sqrt{3} i) \cdot (9 + 9 \sqrt{3} i)}$

Step 1.2

Cancel the common factors.

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Step 1.2.1

Factor $9$ out of $(9 + 9 \sqrt{3} i) \cdot (9 + 9 \sqrt{3} i)$ .

$\frac{9 ((- \sqrt{3} - i) \cdot (9 - 9 \sqrt{3} i))}{9 ((1 + \sqrt{3} i) \cdot (9 + 9 \sqrt{3} i))}$

Step 1.2.2

Cancel the common factor.

$\frac{9 ((- \sqrt{3} - i) \cdot (9 - 9 \sqrt{3} i))}{9 ((1 + \sqrt{3} i) \cdot (9 + 9 \sqrt{3} i))}$

Step 1.2.3

Rewrite the expression.

$\frac{(- \sqrt{3} - i) \cdot (9 - 9 \sqrt{3} i)}{(1 + \sqrt{3} i) \cdot (9 + 9 \sqrt{3} i)}$

Step 2

Cancel the common factor of $9 - 9 \sqrt{3} i$ and $9 + 9 \sqrt{3} i$ .

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Step 2.1

Factor $9$ out of $(- \sqrt{3} - i) \cdot (9 - 9 \sqrt{3} i)$ .

$\frac{9 ((- \sqrt{3} - i) \cdot (1 - \sqrt{3} i))}{(1 + \sqrt{3} i) \cdot (9 + 9 \sqrt{3} i)}$

Step 2.2

Cancel the common factors.

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Step 2.2.1

Factor $9$ out of $(1 + \sqrt{3} i) \cdot (9 + 9 \sqrt{3} i)$ .

$\frac{9 ((- \sqrt{3} - i) \cdot (1 - \sqrt{3} i))}{9 ((1 + \sqrt{3} i) \cdot (1 + \sqrt{3} i))}$

Step 2.2.2

Cancel the common factor.

$\frac{9 ((- \sqrt{3} - i) \cdot (1 - \sqrt{3} i))}{9 ((1 + \sqrt{3} i) \cdot (1 + \sqrt{3} i))}$

Step 2.2.3

Rewrite the expression.

$\frac{(- \sqrt{3} - i) \cdot (1 - \sqrt{3} i)}{(1 + \sqrt{3} i) \cdot (1 + \sqrt{3} i)}$

Step 3

Multiply $\frac{(- \sqrt{3} - i) \cdot (1 - \sqrt{3} i)}{(1 + \sqrt{3} i) \cdot (1 + \sqrt{3} i)}$ by $\frac{1 - \sqrt{3} i}{1 - \sqrt{3} i}$ .

$\frac{(- \sqrt{3} - i) \cdot (1 - \sqrt{3} i)}{(1 + \sqrt{3} i) \cdot (1 + \sqrt{3} i)} \cdot \frac{1 - \sqrt{3} i}{1 - \sqrt{3} i}$

Step 4

Multiply $\frac{(- \sqrt{3} - i) \cdot (1 - \sqrt{3} i)}{(1 + \sqrt{3} i) \cdot (1 + \sqrt{3} i)}$ by $\frac{1 - \sqrt{3} i}{1 - \sqrt{3} i}$ .

$\frac{(- \sqrt{3} - i) \cdot (1 - \sqrt{3} i) (1 - \sqrt{3} i)}{(1 + \sqrt{3} i) \cdot (1 + \sqrt{3} i) (1 - \sqrt{3} i)}$

Step 5

Reorder.

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Step 5.1

Move $1 + \sqrt{3} i$ .

$\frac{(- \sqrt{3} - i) \cdot (1 - \sqrt{3} i) (1 - \sqrt{3} i)}{(1 + \sqrt{3} i) ((1 + \sqrt{3} i) (1 - \sqrt{3} i))}$

Step 5.2

Expand the denominator using the FOIL method.

$\frac{(- \sqrt{3} - i) \cdot (1 - \sqrt{3} i) (1 - \sqrt{3} i)}{(1 + \sqrt{3} i) (1 - (\sqrt{3} i) + \sqrt{3} i - {\sqrt{3}}^{2} i^{2})}$

Step 5.3

Simplify.

$\frac{(- \sqrt{3} - i) \cdot (1 - \sqrt{3} i) (1 - \sqrt{3} i)}{(1 + \sqrt{3} i) \cdot 4}$

Step 5.4

Move $4$ to the left of $1 + \sqrt{3} i$ .

$\frac{(- \sqrt{3} - i) \cdot (1 - \sqrt{3} i) (1 - \sqrt{3} i)}{4 \cdot (1 + \sqrt{3} i)}$

Step 6

Multiply $\frac{(- \sqrt{3} - i) \cdot (1 - \sqrt{3} i) (1 - \sqrt{3} i)}{4 \cdot (1 + \sqrt{3} i)}$ by $\frac{1 - \sqrt{3} i}{1 - \sqrt{3} i}$ .

$\frac{(- \sqrt{3} - i) \cdot (1 - \sqrt{3} i) (1 - \sqrt{3} i)}{4 \cdot (1 + \sqrt{3} i)} \cdot \frac{1 - \sqrt{3} i}{1 - \sqrt{3} i}$

Step 7

Multiply $\frac{(- \sqrt{3} - i) \cdot (1 - \sqrt{3} i) (1 - \sqrt{3} i)}{4 \cdot (1 + \sqrt{3} i)}$ by $\frac{1 - \sqrt{3} i}{1 - \sqrt{3} i}$ .

$\frac{(- \sqrt{3} - i) \cdot (1 - \sqrt{3} i) (1 - \sqrt{3} i) (1 - \sqrt{3} i)}{4 \cdot (1 + \sqrt{3} i) (1 - \sqrt{3} i)}$

Step 8

Reorder.

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Step 8.1

Move $1 + \sqrt{3} i$ .

$\frac{(- \sqrt{3} - i) \cdot (1 - \sqrt{3} i) (1 - \sqrt{3} i) (1 - \sqrt{3} i)}{4 ((1 + \sqrt{3} i) (1 - \sqrt{3} i))}$

Step 8.2

Expand the denominator using the FOIL method.

$\frac{(- \sqrt{3} - i) \cdot (1 - \sqrt{3} i) (1 - \sqrt{3} i) (1 - \sqrt{3} i)}{4 (1 - (\sqrt{3} i) + \sqrt{3} i - {\sqrt{3}}^{2} i^{2})}$

Step 8.3

Simplify.

$\frac{(- \sqrt{3} - i) \cdot (1 - \sqrt{3} i) (1 - \sqrt{3} i) (1 - \sqrt{3} i)}{4 \cdot 4}$

Step 9

Multiply $1 - \sqrt{3} i$ by $1 - \sqrt{3} i$ by adding the exponents.

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Step 9.1

Move $1 - \sqrt{3} i$ .

$\frac{(- \sqrt{3} - i) \cdot ((1 - \sqrt{3} i) (1 - \sqrt{3} i)) (1 - \sqrt{3} i)}{4 \cdot 4}$

Step 9.2

Multiply $1 - \sqrt{3} i$ by $1 - \sqrt{3} i$ .

$\frac{(- \sqrt{3} - i) \cdot {(1 - \sqrt{3} i)}^{2} (1 - \sqrt{3} i)}{4 \cdot 4}$

Step 10

Multiply ${(1 - \sqrt{3} i)}^{2}$ by $1 - \sqrt{3} i$ by adding the exponents.

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Step 10.1

Move $1 - \sqrt{3} i$ .

$\frac{(- \sqrt{3} - i) \cdot ((1 - \sqrt{3} i) {(1 - \sqrt{3} i)}^{2})}{4 \cdot 4}$

Step 10.2

Multiply $1 - \sqrt{3} i$ by ${(1 - \sqrt{3} i)}^{2}$ .

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Step 10.2.1

Raise $1 - \sqrt{3} i$ to the power of $1$ .

$\frac{(- \sqrt{3} - i) \cdot ({(1 - \sqrt{3} i)}^{1} {(1 - \sqrt{3} i)}^{2})}{4 \cdot 4}$

Step 10.2.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{(- \sqrt{3} - i) \cdot {(1 - \sqrt{3} i)}^{1 + 2}}{4 \cdot 4}$

Step 10.3

Add $1$ and $2$ .

$\frac{(- \sqrt{3} - i) \cdot {(1 - \sqrt{3} i)}^{3}}{4 \cdot 4}$

Step 11

Factor $- 1$ out of $- \sqrt{3}$ .

$\frac{(- (\sqrt{3}) - i) {(1 - \sqrt{3} i)}^{3}}{4 \cdot 4}$

Step 12

Factor $- 1$ out of $- i$ .

$\frac{(- (\sqrt{3}) - (i)) {(1 - \sqrt{3} i)}^{3}}{4 \cdot 4}$

Step 13

Factor $- 1$ out of $- (\sqrt{3}) - (i)$ .

$\frac{- (\sqrt{3} + i) {(1 - \sqrt{3} i)}^{3}}{4 \cdot 4}$

Step 14

Simplify the expression.

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Step 14.1

Rewrite $- (\sqrt{3} + i)$ as $- 1 (\sqrt{3} + i)$ .

$\frac{- 1 (\sqrt{3} + i) {(1 - \sqrt{3} i)}^{3}}{4 \cdot 4}$

Step 14.2

Move the negative in front of the fraction.

$- \frac{(\sqrt{3} + i) {(1 - \sqrt{3} i)}^{3}}{4 \cdot 4}$

Step 14.3

Multiply $4$ by $4$ .

$- \frac{(\sqrt{3} + i) {(1 - \sqrt{3} i)}^{3}}{16}$