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Q.

∫0πln(1+cosθ)dθ

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a

π2ln2

b

πln2

c

−π2ln2

d

−πln2

answer is D.

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Detailed Solution

I=∫0πln(1+cosθ)dθ,θ→π−θ I=∫0πln(1−cosθ)dθ 2I=∫0πln(1+cosθ)(1−cosθ)dθ=∫0πlnsin2θdθ       =2∫0πlnsinθdθ=4∫0π2lnsinθdθ       =4(−π2ln2)=−2πln2→I=−πln2
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