Trigonometry Examples

$(\sqrt{18}, \sqrt{30})$

Step 1

To find the $\tan (θ)$ between the x-axis and the line between the points $(0, 0)$ and $(\sqrt{18}, \sqrt{30})$ , draw the triangle between the three points $(0, 0)$ , $(\sqrt{18}, 0)$ , and $(\sqrt{18}, \sqrt{30})$ .

Opposite : $\sqrt{30}$

Adjacent : $\sqrt{18}$

Step 2

$\tan (θ) = \frac{Opposite}{Adjacent}$ therefore $\tan (θ) = \frac{\sqrt{30}}{\sqrt{18}}$ .

$\frac{\sqrt{30}}{\sqrt{18}}$

Step 3

Simplify $\tan (θ)$ .

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Step 3.1

Combine $\sqrt{30}$ and $\sqrt{18}$ into a single radical.

$\tan (θ) = \sqrt{\frac{30}{18}}$

Step 3.2

Cancel the common factor of $30$ and $18$ .

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Step 3.2.1

Factor $6$ out of $30$ .

$\tan (θ) = \sqrt{\frac{6 (5)}{18}}$

Step 3.2.2

Cancel the common factors.

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Step 3.2.2.1

Factor $6$ out of $18$ .

$\tan (θ) = \sqrt{\frac{6 \cdot 5}{6 \cdot 3}}$

Step 3.2.2.2

Cancel the common factor.

$\tan (θ) = \sqrt{\frac{6 \cdot 5}{6 \cdot 3}}$

Step 3.2.2.3

Rewrite the expression.

$\tan (θ) = \sqrt{\frac{5}{3}}$

Step 3.3

Rewrite $\sqrt{\frac{5}{3}}$ as $\frac{\sqrt{5}}{\sqrt{3}}$ .

$\tan (θ) = \frac{\sqrt{5}}{\sqrt{3}}$

Step 3.4

Multiply $\frac{\sqrt{5}}{\sqrt{3}}$ by $\frac{\sqrt{3}}{\sqrt{3}}$ .

$\tan (θ) = \frac{\sqrt{5}}{\sqrt{3}} \cdot \frac{\sqrt{3}}{\sqrt{3}}$

Step 3.5

Combine and simplify the denominator.

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Step 3.5.1

Multiply $\frac{\sqrt{5}}{\sqrt{3}}$ by $\frac{\sqrt{3}}{\sqrt{3}}$ .

$\tan (θ) = \frac{\sqrt{5} \sqrt{3}}{\sqrt{3} \sqrt{3}}$

Step 3.5.2

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

$\tan (θ) = \frac{\sqrt{5} \sqrt{3}}{\sqrt{3} \sqrt{3}}$

Step 3.5.3

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

$\tan (θ) = \frac{\sqrt{5} \sqrt{3}}{\sqrt{3} \sqrt{3}}$

Step 3.5.4

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

$\tan (θ) = \frac{\sqrt{5} \sqrt{3}}{{\sqrt{3}}^{1 + 1}}$

Step 3.5.5

Add $1$ and $1$ .

$\tan (θ) = \frac{\sqrt{5} \sqrt{3}}{{\sqrt{3}}^{2}}$

Step 3.5.6

Rewrite ${\sqrt{3}}^{2}$ as $3$ .

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Step 3.5.6.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{3}$ as $3^{\frac{1}{2}}$ .

$\tan (θ) = \frac{\sqrt{5} \sqrt{3}}{{(3^{\frac{1}{2}})}^{2}}$

Step 3.5.6.2

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

$\tan (θ) = \frac{\sqrt{5} \sqrt{3}}{3^{\frac{1}{2} \cdot 2}}$

Step 3.5.6.3

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

$\tan (θ) = \frac{\sqrt{5} \sqrt{3}}{3^{\frac{2}{2}}}$

Step 3.5.6.4

Cancel the common factor of $2$ .

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Step 3.5.6.4.1

Cancel the common factor.

$\tan (θ) = \frac{\sqrt{5} \sqrt{3}}{3^{\frac{2}{2}}}$

Step 3.5.6.4.2

Rewrite the expression.

$\tan (θ) = \frac{\sqrt{5} \sqrt{3}}{3}$

Step 3.5.6.5

Evaluate the exponent.

$\tan (θ) = \frac{\sqrt{5} \sqrt{3}}{3}$

Step 3.6

Simplify the numerator.

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Step 3.6.1

Combine using the product rule for radicals.

$\tan (θ) = \frac{\sqrt{5 \cdot 3}}{3}$

Step 3.6.2

Multiply $5$ by $3$ .

$\tan (θ) = \frac{\sqrt{15}}{3}$

Step 4

Approximate the result.

$\tan (θ) = \frac{\sqrt{15}}{3} \approx 1.29099444$