Trigonometry Examples

$- 4 \cot (- 45)$

Step 1

Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because cotangent is negative in the fourth quadrant.

$- 4 (- \cot (45))$

Step 2

The exact value of $\cot (45)$ is $1$ .

$- 4 (- 1 \cdot 1)$

Step 3

Multiply $- 4 (- 1 \cdot 1)$ .

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Step 3.1

Multiply $- 1$ by $1$ .

$- 4 \cdot - 1$

Step 3.2

Multiply $- 4$ by $- 1$ .

$4$

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