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Question

The maximum value of the function f(x)=10t sin(x+πt)dt, xR is -

A
1ππ2+4
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B
1π2π2+4
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C
π2+4
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D
12π2π2+4
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Solution

The correct option is B 1π2π2+4
f(x)=[tπ cos(x+tπ)]10+1π10cos(x+tπ)dt

=1π cos x2π2 sin x

f(x)max.=1π2+4π4=π2+4π2

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