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The least and the greatest values of (si...

The least and the greatest values of `(sin^(-1)x)^3+(cos^(-1)x)^3` are `(-pi)/2,pi/2` (b) `(-pi^3)/8,(pi^3)/8` `(pi^3)/(32),(7pi^3)/8` (d) none of these

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The correct Answer is:
`(7pi^(3))/8`
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