sin 4x − cos 2x = 0

2sin 2x cos 2x − cos 2x = 0

cos2x (2sin 2x - 1) = 0


EITHER

cos 2x = 0

image

image

OR

sin 2x = 1/2

image

image


Or, in decimal form:

x = 0.26, 0.79, 1.31, 2.36, 3.40, 3.93, 4.45, 5.50.

The graph of y = sin 4x − cos 2x is of the form:

image