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Int( sin(x) / ( 1+cos(x) ) )

= Int (-du/u) Perform a u-substitution, u=1+cosx du=d/dx(1+cosx)=-sinx

=-ln |u| + C negative pulls out of integral (Don't forget the constant)

=ln|1+cosx|+C

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Q: What is integral of sin x by 1 plus cos x?
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