Question

cos 3a (2sin 2a-1)=0

Answer 1

Answer:

cos3A.(2sin2A−1)=0

cos3A=0 or 2sin2A=1

3A=90 or 2A=30

A=30∘ or A=15∘

Thus, A=30∘,15∘

Step-by-step explanation:

Answer 2

cos 3a = 0
sin (90-3a) = 0
3a = 90
a = 90/3 = 30
2sin2a = 1
2a = 1/2 = 30
a = 30/2 = 15


Answer us : 15 and 30


HOPE IT HELPS YOU!!!