First slide

Introduction to integration

Question

$\int \frac{\cos x - c o x 2 x}{1 - \cos x} d x =$

Easy

A

$x + 2 \sin x + c$
B

$x + 2 \cos x + c$
C

$x - 2 \cos x + c$
D

$x - 2 \sin x + c$

Solution

$\begin{array}{l} \cos x - \cos 2 x = \cos x - 2 \cos^{2} x + 1 \\ = (1 - \cos x) (1 + 2 \cos x) \end{array}$

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