Trigonometry Examples

$\sec (240)$

Step 1

Find the value using the definition of secant.

$\sec (240) = \frac{hypotenuse}{adjacent}$

Step 2

Substitute the values into the definition.

$\sec (240) = \frac{1}{- \frac{1}{2}}$

Step 3

Simplify the result.

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Step 3.1

Cancel the common factor of $1$ and $- 1$ .

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Step 3.1.1

Rewrite $1$ as $- 1 (- 1)$ .

$\frac{- 1 (- 1)}{- \frac{1}{2}}$

Step 3.1.2

Move the negative in front of the fraction.

$- \frac{1}{\frac{1}{2}}$

Step 3.2

Multiply the numerator by the reciprocal of the denominator.

$- (1 \cdot 2)$

Step 3.3

Multiply $- (1 \cdot 2)$ .

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Step 3.3.1

Multiply $2$ by $1$ .

$- 1 \cdot 2$

Step 3.3.2

Multiply $- 1$ by $2$ .

$- 2$

Step 4