Question

To solve the equation 2sin(2x)=cosx, you should rewrite it as _____.

Answer 1

Answer:

A)cosx(4sinx-1)=0

Step-by-step explanation:

The given equation is

$2 \sin(2x) = \cos(x)$

We equate everything to zero to get:

$2 \sin(2x) - \cos(x) = 0$

Use the double angle property, to get:

$2 (2\sin(x) \: \cos(x) ) - \cos(x) = 0$

This implies that:

$\cos x(4\sin \: x - 1) = 0$

The correct answer is A