Question

cos2 a=sin4 a

find the value a ​

Answer 1

cos2a = sin4a

cos2a = cos (90-4a)

2a = 90-4a

6a= 90

a = 15

Answer 2

Answer:

15

Step-by-step explanation:

$\cos(2a) = \sin(4a)$

$\sin (90 - 2a) = \sin(4a)$

comparing both side...

we get,

90-2a = 4a

90 = 4a + 2a

90/6 = a

15 = a