Trigonometry Examples

$(\frac{\sqrt{2}}{2}, \frac{\sqrt{2}}{2})$

Step 1

Convert from rectangular coordinates $(x, y)$ to polar coordinates $(r, θ)$ using the conversion formulas.

$r = \sqrt{x^{2} + y^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 2

Replace $x$ and $y$ with the actual values.

$r = \sqrt{{(\frac{\sqrt{2}}{2})}^{2} + {(\frac{\sqrt{2}}{2})}^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3

Find the magnitude of the polar coordinate.

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Step 3.1

Apply the product rule to $\frac{\sqrt{2}}{2}$ .

$r = \sqrt{\frac{{\sqrt{2}}^{2}}{2^{2}} + {(\frac{\sqrt{2}}{2})}^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.2

Rewrite ${\sqrt{2}}^{2}$ as $2$ .

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Step 3.2.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{2}$ as $2^{\frac{1}{2}}$ .

$r = \sqrt{\frac{{(2^{\frac{1}{2}})}^{2}}{2^{2}} + {(\frac{\sqrt{2}}{2})}^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.2.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$r = \sqrt{\frac{2^{\frac{1}{2} \cdot 2}}{2^{2}} + {(\frac{\sqrt{2}}{2})}^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.2.3

Combine $\frac{1}{2}$ and $2$ .

$r = \sqrt{\frac{2^{\frac{2}{2}}}{2^{2}} + {(\frac{\sqrt{2}}{2})}^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.2.4

Cancel the common factor of $2$ .

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Step 3.2.4.1

Cancel the common factor.

$r = \sqrt{\frac{2^{\frac{2}{2}}}{2^{2}} + {(\frac{\sqrt{2}}{2})}^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.2.4.2

Rewrite the expression.

$r = \sqrt{\frac{2}{2^{2}} + {(\frac{\sqrt{2}}{2})}^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

$r = \sqrt{\frac{2}{2^{2}} + {(\frac{\sqrt{2}}{2})}^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.2.5

Evaluate the exponent.

$r = \sqrt{\frac{2}{2^{2}} + {(\frac{\sqrt{2}}{2})}^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

$r = \sqrt{\frac{2}{2^{2}} + {(\frac{\sqrt{2}}{2})}^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.3

Raise $2$ to the power of $2$ .

$r = \sqrt{\frac{2}{4} + {(\frac{\sqrt{2}}{2})}^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.4

Cancel the common factor of $2$ and $4$ .

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Step 3.4.1

Factor $2$ out of $2$ .

$r = \sqrt{\frac{2 (1)}{4} + {(\frac{\sqrt{2}}{2})}^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.4.2

Cancel the common factors.

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Step 3.4.2.1

Factor $2$ out of $4$ .

$r = \sqrt{\frac{2 \cdot 1}{2 \cdot 2} + {(\frac{\sqrt{2}}{2})}^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.4.2.2

Cancel the common factor.

$r = \sqrt{\frac{2 \cdot 1}{2 \cdot 2} + {(\frac{\sqrt{2}}{2})}^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.4.2.3

Rewrite the expression.

$r = \sqrt{\frac{1}{2} + {(\frac{\sqrt{2}}{2})}^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

$r = \sqrt{\frac{1}{2} + {(\frac{\sqrt{2}}{2})}^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

$r = \sqrt{\frac{1}{2} + {(\frac{\sqrt{2}}{2})}^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.5

Apply the product rule to $\frac{\sqrt{2}}{2}$ .

$r = \sqrt{\frac{1}{2} + \frac{{\sqrt{2}}^{2}}{2^{2}}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.6

Rewrite ${\sqrt{2}}^{2}$ as $2$ .

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Step 3.6.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{2}$ as $2^{\frac{1}{2}}$ .

$r = \sqrt{\frac{1}{2} + \frac{{(2^{\frac{1}{2}})}^{2}}{2^{2}}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.6.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$r = \sqrt{\frac{1}{2} + \frac{2^{\frac{1}{2} \cdot 2}}{2^{2}}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.6.3

Combine $\frac{1}{2}$ and $2$ .

$r = \sqrt{\frac{1}{2} + \frac{2^{\frac{2}{2}}}{2^{2}}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.6.4

Cancel the common factor of $2$ .

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Step 3.6.4.1

Cancel the common factor.

$r = \sqrt{\frac{1}{2} + \frac{2^{\frac{2}{2}}}{2^{2}}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.6.4.2

Rewrite the expression.

$r = \sqrt{\frac{1}{2} + \frac{2}{2^{2}}}$

$θ = t a n^{- 1} (\frac{y}{x})$

$r = \sqrt{\frac{1}{2} + \frac{2}{2^{2}}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.6.5

Evaluate the exponent.

$r = \sqrt{\frac{1}{2} + \frac{2}{2^{2}}}$

$θ = t a n^{- 1} (\frac{y}{x})$

$r = \sqrt{\frac{1}{2} + \frac{2}{2^{2}}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.7

Raise $2$ to the power of $2$ .

$r = \sqrt{\frac{1}{2} + \frac{2}{4}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.8

Cancel the common factor of $2$ and $4$ .

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Step 3.8.1

Factor $2$ out of $2$ .

$r = \sqrt{\frac{1}{2} + \frac{2 (1)}{4}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.8.2

Cancel the common factors.

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Step 3.8.2.1

Factor $2$ out of $4$ .

$r = \sqrt{\frac{1}{2} + \frac{2 \cdot 1}{2 \cdot 2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.8.2.2

Cancel the common factor.

$r = \sqrt{\frac{1}{2} + \frac{2 \cdot 1}{2 \cdot 2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.8.2.3

Rewrite the expression.

$r = \sqrt{\frac{1}{2} + \frac{1}{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

$r = \sqrt{\frac{1}{2} + \frac{1}{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

$r = \sqrt{\frac{1}{2} + \frac{1}{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.9

Simplify the expression.

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Step 3.9.1

Combine the numerators over the common denominator.

$r = \sqrt{\frac{1 + 1}{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.9.2

Add $1$ and $1$ .

$r = \sqrt{\frac{2}{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.9.3

Divide $2$ by $2$ .

$r = \sqrt{1}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.9.4

Any root of $1$ is $1$ .

$r = 1$

$θ = t a n^{- 1} (\frac{y}{x})$

$r = 1$

$θ = t a n^{- 1} (\frac{y}{x})$

$r = 1$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 4

Replace $x$ and $y$ with the actual values.

$r = 1$

$θ = t a n^{- 1} (\frac{\frac{\sqrt{2}}{2}}{\frac{\sqrt{2}}{2}})$

Step 5

The inverse tangent of $1$ is $θ = 45 °$ .

$r = 1$

$θ = 45 °$

Step 6

This is the result of the conversion to polar coordinates in $(r, θ)$ form.

$(1, 45 °)$