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If a = sin^(-1) (sin 5) and b = cos^(-1)...

If `a = sin^(-1) (sin 5)` and `b = cos^(-1) (cos 5)` then value of `a^2 + b^2` is

A

`4 pi^(2)+25`

B

`8 pi^(2)-40 pi+50`

C

`25`

D

`4 pi^(2)-20 pi+50`

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