int frac{dx}{tan x+cot x+sec x+operatorname{c | vedclass

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Question

(C) We have,$\int \frac{dx}{	an x+\cot x+\sec x+\operatorname{cosec} x} = \int \frac{dx}{\frac{\sin x}{\cos x}+\frac{\cos x}{\sin x}+\frac{1}{\cos x}

Vedclass · Accepted Answer

$\frac{1}{2}(\sin x-\cos x-x)+c$

Vedclass · Answer

(C) We have,$\int \frac{dx}{	an x+\cot x+\sec x+\operatorname{cosec} x} = \int \frac{dx}{\frac{\sin x}{\cos x}+\frac{\cos x}{\sin x}+\frac{1}{\cos x}+\frac{1}{\sin x}}$$= \int \frac{\sin x \cos x dx}{\sin^2 x+\cos^2 x+\sin x+\cos x} = \int \frac{\sin x \cos x dx}{1+\sin x+\cos x}$Multiplying and dividing by $2$,we get $\frac{1}{2} \int \frac{2 \sin x \cos x}{1+\sin x+\cos x} dx$$= \frac{1}{2} \int \frac{2 \sin x \cos x + 1 - 1}{1+\sin x+\cos x} dx = \frac{1}{2} \int \frac{(\sin^2 x+\cos^2 x+2 \sin x \cos x)-1}{1+\sin x+\cos x} dx$$= \frac{1}{2} \int \frac{(\sin x+\cos x)^2-1}{1+\sin x+\cos x} dx = \frac{1}{2} \int \frac{(\sin x+\cos x+1)(\sin x+\cos x-1)}{1+\sin x+\cos x} dx$$= \frac{1}{2} \int (\sin x+\cos x-1) dx = \frac{1}{2} [-\cos x+\sin x-x]+c = \frac{1}{2}(\sin x-\cos x-x)+c$

$\int \frac{dx}{\tan x+\cot x+\sec x+\operatorname{cosec} x} = $

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