Question

If sin 2x = cos 4x, find:
(i). x
(ii) tan 3x
(iii) sin2 2x + cos2 4x

Answer 1

Answer:

2 is correct.................

Answer 2

Answer:

x = 15

Step-by-step explanation:

sin2x = cos4x

sin2x = cos(90-4x)

sin2x = sin(90-4x)

2x = 90-4x

90 = 4x+2x

90 = 6x

x = 15

tan3x = tan3*15

tan45 = 1

similarly the rest.......