If int frac{cos x+x}{1+sin x} d x=f(x)+int fr | vedclass

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Question

(A) Given $\int \frac{\cos x+x}{1+\sin x} d x=f(x)+\int \frac{3 \cos \frac{x}{2}-\sin \frac{x}{2}}{\cos \frac{x}{2}+\sin \frac{x}{2}} d x+c_r$. $f(x)

Vedclass · Accepted Answer

$\frac{-2 x}{1+	an \frac{x}{2}}$

Vedclass · Answer

(A) Given $\int \frac{\cos x+x}{1+\sin x} d x=f(x)+\int \frac{3 \cos \frac{x}{2}-\sin \frac{x}{2}}{\cos \frac{x}{2}+\sin \frac{x}{2}} d x+c_r$. $f(x) = \int \left( \frac{\cos x+x}{1+\sin x} - \frac{3 \cos \frac{x}{2}-\sin \frac{x}{2}}{\cos \frac{x}{2}+\sin \frac{x}{2}} ight) d x$. Using $1+\sin x = (\cos \frac{x}{2} + \sin \frac{x}{2})^2$ and $\cos x = \cos^2 \frac{x}{2} - \sin^2 \frac{x}{2}$,we simplify the integrand. Note that $\frac{3 \cos \frac{x}{2}-\sin \frac{x}{2}}{\cos \frac{x}{2}+\sin \frac{x}{2}} = \frac{(3 \cos \frac{x}{2}-\sin \frac{x}{2})(\cos \frac{x}{2}+\sin \frac{x}{2})}{1+\sin x} = \frac{3 \cos^2 \frac{x}{2} + 2 \sin \frac{x}{2} \cos \frac{x}{2} - \sin^2 \frac{x}{2}}{1+\sin x} = \frac{2 \cos^2 \frac{x}{2} + \sin x + 1}{1+\sin x} = \frac{1+\cos x + \sin x}{1+\sin x} = \frac{\cos x}{1+\sin x} + 1$. Substituting this back,$f(x) = \int \left( \frac{\cos x+x}{1+\sin x} - (\frac{\cos x}{1+\sin x} + 1) ight) d x = \int (\frac{x}{1+\sin x} - 1) d x$. Using $1+\sin x = (\cos \frac{x}{2} + \sin \frac{x}{2})^2$,we find $f(x) = \frac{-2x}{1+	an \frac{x}{2}}$. Thus,the correct option is $A$.

If $\int \frac{\cos x+x}{1+\sin x} d x=f(x)+\int \frac{3 \cos \frac{x}{2}-\sin \frac{x}{2}}{\cos \frac{x}{2}+\sin \frac{x}{2}} d x+c_r$ then $f(x)=$

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