Find the Exact Value cos(7pi)

$\cos (7 π)$

Remove full rotations of $2 π$ until the angle is between $0$ and $2 π$ .

$\cos (π)$

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.

$- \cos (0)$

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

$- 1 \cdot 1$

Multiply $- 1$ by $1$ .

$- 1$

Find the Exact Value cos(7pi)

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