Question

pls solve this problem ​

Answer 1

Answer:

cos2x = cos(90°-30°)•cos(90°-60°)+sin30°•sin60°

cos2x = sin30°•sin60°+sin30°•sin60°

cos2x = 1

Now,

sin²2x + cos²2x =1 (formula)

sin²2x + 1=1

:. sin²2x=1-1=0

I Hope It Will Help!

^_^