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Question

Question: \(\int _ { - \frac { 1 } { 2 } } ^ { \frac { 1 } { 2 } } \cos x \ln \frac { 1 + x } { 1 - x } d x\) ...

1212cosxln1+x1xdx\int _ { - \frac { 1 } { 2 } } ^ { \frac { 1 } { 2 } } \cos x \ln \frac { 1 + x } { 1 - x } d x is equal to

A

0

B

1

C

2

D

ln 3

Answer

0

Explanation

Solution

I=1/21/2cosxln(1+x1x)dxI = \int _ { - 1 / 2 } ^ { 1 / 2 } \cos x \ln \left( \frac { 1 + x } { 1 - x } \right) d x

f(x)=f(x)f ( - x ) = - f ( x ))

I=0I = 0.