Calculus Examples

$\sin (\cos (π))$

Step 1

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

$\sin (- \cos (0))$

Step 2

The exact value of $\cos (0)$ is $1$ .

$\sin (- 1 \cdot 1)$

Step 3

Multiply $- 1$ by $1$ .

$\sin (- 1)$

Step 4

The result can be shown in multiple forms.

Exact Form:

$\sin (- 1)$

Decimal Form:

$- 0.84147098 \dots$