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Question

If f(x)=|cosx| then f(3π4) is equal to-

A
12
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B
12
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C
1
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D
None of these
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Solution

The correct option is B 12
Clearly, π2<3π4<πcosx<0 in this interval
y=cosx
dydx=sinx
(dydx)3π/4=sin3π4=12

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