Precalculus Examples

$4 \sin (90) - 3 \tan (180)$

Step 1

Simplify each term.

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Step 1.1

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

$4 \cdot 1 - 3 \tan (180)$

Step 1.2

Multiply $4$ by $1$ .

$4 - 3 \tan (180)$

Step 1.3

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

$4 - 3 (- \tan (0))$

Step 1.4

The exact value of $\tan (0)$ is $0$ .

$4 - 3 (- 0)$

Step 1.5

Multiply $- 3 (- 0)$ .

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Step 1.5.1

Multiply $- 1$ by $0$ .

$4 - 3 \cdot 0$

Step 1.5.2

Multiply $- 3$ by $0$ .

$4 + 0$

Step 2

Add $4$ and $0$ .

$4$