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If `alpha and beta` are the least and the greatest values of `f(x)= (sin^(-1)x)^(2) + (cos^(-1)x)^(2)` for all
`x in ` R respectively, then `8 (alpha + beta)=`

A

A `pi^(2)`

B

B `11pi^(2)`

C

C `9pi^(2)`

D

D `25pi^(2)`

Text Solution

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The correct Answer is:
B
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