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Let f(x) = |(cosx,sinx,cosx),(cos2x,sin2...

Let `f(x) = |(cosx,sinx,cosx),(cos2x,sin2x,2cos2x),(cos3x,sin3x,3cos3x)|` then the value of `f'(pi/2)` is :

A

0

B

`-12`

C

`4`

D

`12`

Text Solution

Verified by Experts

The correct Answer is:
C
Differentiate column wise, where
`Delta_(1) = -4: Delta_(2) = 0` and `Delta_(3) = 8]`
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