Trigonometry Examples

$(\sqrt{7}, 3)$

Step 1

To find the $\sec (θ)$ between the x-axis and the line between the points $(0, 0)$ and $(\sqrt{7}, 3)$ , draw the triangle between the three points $(0, 0)$ , $(\sqrt{7}, 0)$ , and $(\sqrt{7}, 3)$ .

Opposite : $3$

Adjacent : $\sqrt{7}$

Step 2

Find the hypotenuse using Pythagorean theorem $c = \sqrt{a^{2} + b^{2}}$ .

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Step 2.1

Rewrite ${\sqrt{7}}^{2}$ as $7$ .

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Step 2.1.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{7}$ as $7^{\frac{1}{2}}$ .

$\sqrt{{(7^{\frac{1}{2}})}^{2} + {(3)}^{2}}$

Step 2.1.2

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

$\sqrt{7^{\frac{1}{2} \cdot 2} + {(3)}^{2}}$

Step 2.1.3

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

$\sqrt{7^{\frac{2}{2}} + {(3)}^{2}}$

Step 2.1.4

Cancel the common factor of $2$ .

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Step 2.1.4.1

Cancel the common factor.

$\sqrt{7^{\frac{2}{2}} + {(3)}^{2}}$

Step 2.1.4.2

Rewrite the expression.

$\sqrt{7^{1} + {(3)}^{2}}$

Step 2.1.5

Evaluate the exponent.

$\sqrt{7 + {(3)}^{2}}$

Step 2.2

Simplify the expression.

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Step 2.2.1

Raise $3$ to the power of $2$ .

$\sqrt{7 + 9}$

Step 2.2.2

Add $7$ and $9$ .

$\sqrt{16}$

Step 2.2.3

Rewrite $16$ as $4^{2}$ .

$\sqrt{4^{2}}$

Step 2.2.4

Pull terms out from under the radical, assuming positive real numbers.

$4$

Step 3

$\sec (θ) = \frac{Hypotenuse}{Adjacent}$ therefore $\sec (θ) = \frac{4}{\sqrt{7}}$ .

$\frac{4}{\sqrt{7}}$

Step 4

Simplify $\sec (θ)$ .

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Step 4.1

Multiply $\frac{4}{\sqrt{7}}$ by $\frac{\sqrt{7}}{\sqrt{7}}$ .

$\sec (θ) = \frac{4}{\sqrt{7}} \cdot \frac{\sqrt{7}}{\sqrt{7}}$

Step 4.2

Combine and simplify the denominator.

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Step 4.2.1

Multiply $\frac{4}{\sqrt{7}}$ by $\frac{\sqrt{7}}{\sqrt{7}}$ .

$\sec (θ) = \frac{4 \sqrt{7}}{\sqrt{7} \sqrt{7}}$

Step 4.2.2

Raise $\sqrt{7}$ to the power of $1$ .

$\sec (θ) = \frac{4 \sqrt{7}}{\sqrt{7} \sqrt{7}}$

Step 4.2.3

Raise $\sqrt{7}$ to the power of $1$ .

$\sec (θ) = \frac{4 \sqrt{7}}{\sqrt{7} \sqrt{7}}$

Step 4.2.4

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

$\sec (θ) = \frac{4 \sqrt{7}}{{\sqrt{7}}^{1 + 1}}$

Step 4.2.5

Add $1$ and $1$ .

$\sec (θ) = \frac{4 \sqrt{7}}{{\sqrt{7}}^{2}}$

Step 4.2.6

Rewrite ${\sqrt{7}}^{2}$ as $7$ .

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Step 4.2.6.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{7}$ as $7^{\frac{1}{2}}$ .

$\sec (θ) = \frac{4 \sqrt{7}}{{(7^{\frac{1}{2}})}^{2}}$

Step 4.2.6.2

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

$\sec (θ) = \frac{4 \sqrt{7}}{7^{\frac{1}{2} \cdot 2}}$

Step 4.2.6.3

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

$\sec (θ) = \frac{4 \sqrt{7}}{7^{\frac{2}{2}}}$

Step 4.2.6.4

Cancel the common factor of $2$ .

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Step 4.2.6.4.1

Cancel the common factor.

$\sec (θ) = \frac{4 \sqrt{7}}{7^{\frac{2}{2}}}$

Step 4.2.6.4.2

Rewrite the expression.

$\sec (θ) = \frac{4 \sqrt{7}}{7}$

Step 4.2.6.5

Evaluate the exponent.

$\sec (θ) = \frac{4 \sqrt{7}}{7}$

Step 5

Approximate the result.

$\sec (θ) = \frac{4 \sqrt{7}}{7} \approx 1.51185789$