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The greatest and least values of (sin^-1...

The greatest and least values of `(sin^-1 x)^2 + (cos^-1x)^2` are respectively:

A

`(5pi^2)/4 and (pi^2)/8`

B

`pi/2 and -pi/2`

C

`pi^2/4 and (-pi^2)/4`

D

`pi^2/4 and 0`

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