Evaluate the following integrals: `int(sin^(2)x)/((1+cosx)^(2))dx`

1.	Evaluate the following integrals: `int(sin^(2)x)/((1+cosx)^(2))dx`
Answer» Correct Answer - `2"tan"(x)/(2)-x+C` `I=int((1-cos^(2)x))/((1+cosx)^(2))dx=int((1-cosx))/((1+cosx))dx=int"tan"^(2)(x)/(2)dx=int(sec^(2)(x)/(2)-1)dx`.

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