If the principal range of sin^(-1)x is [...

If the principal range of `sin^(-1)x` is `[a pi,b pi]`, then slope of the tangent to the curve `y=-x^(3)+3x^(2)+12x-5` at x=2a is

A

15

B

12

C

`alpha`

D

0

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The correct Answer is:

A

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