Answer:
the answer is b when we have two positives it makes a negitive therefore its b
Step-by-step explanation:
The value is 1/62
if it is wrong I am sorry but it should be
Cos² 2x = (1+cos 4x )/2
cos² 6x = (1+cos 12x)/2
subtract to get 1/2 (cos 4x - cos 12x )
= 1/2 (2 sin 4x sin 8x ) as cos A - cos B = 2 [ sin (A+B)/2 sin (A-B)/2 ]
so the answer
