1.

If int (cos x+x)/(1+sin x) dx=f(x)+int (3"cos"x/2-"sin"x/2)/("cos"x/2+"sin"x/2) dx+c, then f(x)=

Answer»

`(-2 X)/(1+"TAN"x/2)`
`(-x"COS"x/2)/("cos"x/2+"SIN"x/2)`
`(2x)/(1+"tan"x/2)`
`(x"cos"x/2)/("cos"x/2+"sin"x/2)`

Answer :A


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