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f(x)= |(sin x,cos x),(tan x,cot x)| then...

`f(x)= |(sin x,cos x),(tan x,cot x)|` then `f'((pi)/(4))`= …….

A

0

B

`-sqrt2`

C

`-2 sqrt2`

D

`sqrt2`

Text Solution

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The correct Answer is:
D
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