Question

to solve the equation 2sin(2x) = cosx , you should rewite it as ___
a. 2sinx + cosx = 0
b cosx(4sinx-1)= 0
c. cosx(2sinx-1) = 0

Answer 1

hint:
\[\sin(2x) = 2\sin x \cos x\]

Answer 2

.......um

Answer 3

...plug it in

\[4\sin x cosx = \cos x\]

..get right side to be 0

Answer 4

2 sin 2x = cos x
2(2 sin x cos x) - cos x
cos x(4 sin x - 1) = 0

B i think...

Answer 5

actually is def b