Find the Exact Value cos((9pi)/4)

$\cos (\frac{9 π}{4})$

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

$\cos (\frac{π}{4})$

The exact value of $\cos (\frac{π}{4})$ is $\frac{\sqrt{2}}{2}$ .

$\frac{\sqrt{2}}{2}$

The result can be shown in multiple forms.

Exact Form:

$\frac{\sqrt{2}}{2}$

Decimal Form:

$0.70710678 \dots$

Find the Exact Value cos((9pi)/4)

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