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Question

If f(x) = |cos x|, then the value of f'(3π4) is

A
1
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B
12
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C
12
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D
12
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Solution

The correct option is C 12
When π2<x<π, cos x<0so that cos x=cos xf'(x)=sin xHence, f'(3π4)=sin 3π4=12

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