1.

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

Answer»

0
`-12`
`4`
`12`

Solution :Differentiate COLUMN wise, where
`Delta_(1) = -4: Delta_(2) = 0` and `Delta_(3) = 8]`


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