Find the Exact Value cos(pi)^2

$\cos^{2} (π)$

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.

${(- \cos (0))}^{2}$

Step 2

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

${(- 1 \cdot 1)}^{2}$

Step 3

Multiply $- 1$ by $1$ .

${(- 1)}^{2}$

Step 4

Raise $- 1$ to the power of $2$ .

$1$

Find the Exact Value cos(pi)^2

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