1.

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 inR respectively, then 8 (alpha + beta)=

Answer»

A `PI^(2)`
B`11pi^(2)`
C`9pi^(2)`
D`25pi^(2)`

ANSWER :B


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