Find the Exact Value cos((5pi)/2)

$\cos (\frac{5 π}{2})$

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

$\cos (\frac{π}{2})$

The exact value of $\cos (\frac{π}{2})$ is $0$ .

$0$

Find the Exact Value cos((5pi)/2)

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