Remove full rotations of until the angle is between and .

The exact value of is .

The result can be shown in multiple forms.

Exact Form:

Decimal Form:

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

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

Remove full rotations of until the angle is between and .

The exact value of is .

The result can be shown in multiple forms.

Exact Form:

Decimal Form:

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