Trigonometry Examples

$\cot (270) - 2 \sin (90)$

Step 1

Simplify each term.

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Step 1.1

Apply the reference angle by finding the angle with equivalent trig values in the first quadrant.

$\cot (90) - 2 \sin (90)$

Step 1.2

The exact value of $\cot (90)$ is $0$ .

$0 - 2 \sin (90)$

Step 1.3

The exact value of $\sin (90)$ is $1$ .

$0 - 2 \cdot 1$

Step 1.4

Multiply $- 2$ by $1$ .

$0 - 2$

Step 2

Subtract $2$ from $0$ .

$- 2$