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माना f(x)=|{:(cosx,sinx,cosx),(cos2x,sin...

माना `f(x)=|{:(cosx,sinx,cosx),(cos2x,sin2x,2cos2x),(cos3x,sin3x,3cos3x):}|` है, तो `f'((pi)/(2))=`
(i) 0 (ii) `-12` (iii) 4 (iv) 12

A

`0`

B

`-12`

C

`4`

D

`12`

लिखित उत्तर

Verified by Experts

The correct Answer is:
C
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