Question

sin2A=cos(A-30°). value of the A​

Answer 1

Answer:

cos(90-2a)=cos(a-30)

90-2a=a-30

2a+a=90+30

3a=120

a=40

Answer 2

Step-by-step explanation:

$\ \cos (90 - 2a ) = \cos(a - 30)$

$90 - 2a = a - 30$

$120 = 3a$

$a = 40$