Evaluate: x 1+ x d x

MCQ

Evaluate: $\int \frac{\sin x}{1+\sin x} d x$

A
$\sec x-\tan x+C$
B
$\sec x+\tan x+x+C$
C
$\sec x+\tan x+C$
✓
$\sec x-\tan x+x+C$

✓

Answer

Correct option: D.

$\sec x-\tan x+x+C$

(d) : Let $I=\int \frac{\sin x}{1+\sin x} d x=\int \frac{\sin x(1-\sin x)}{(1+\sin x)(1-\sin x)} d x$
$=\int \frac{\sin x-\sin ^2 x}{\cos ^2 x} d x=\int \sec x \tan x d x-\int \tan ^2 x d x$
$=\int \sec x \tan x d x-\int\left(\sec ^2 x-1\right) d x=\sec x-\tan x+x+C$

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