Question: Find the exact value, if any, of each composite function. If there is no value say it is not defined. Do not use a calculator.

Find the exact value, if any, of each composite function. If there is no value say it is "not defined." Do not use a calculator.


1) cos-1 (cos 4π/5)

2) sin-1 (sin 9π/8)

3) cos-1 [cos (-π/4)]

4) sin (sin-1 1/4)

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