Find the Exact Value cos(-(3pi)/8)

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Trigonometry

$\cos (- \frac{3 π}{8})$

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

$\cos (\frac{13 π}{8})$

Evaluate $\cos (\frac{13 π}{8})$ .

$0.38268343$

The result can be shown in multiple forms.

Exact Form:

$\cos (- \frac{3 π}{8})$

Decimal Form:

$0.38268343 \dots$

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