Question

if cos2x = (cos60)( cos 30)+ (sin60)( sin30)find sin2x​

Answer 1

Answer:

0.5

Step-by-step explanation:

cos( A - B ) = cosA cosB + sinA sinB

Given

cos2x = cos60 cos30  + sin60 sin30

cos2x = cos( 60 - 30 )

cos2x = cos 30

Now

sin2x = sin30 = 1/2 =0.5

Hope it Helps