Establish the identity.cos4 x = 
(3 + 4 cos(2x) + cos (4x))
What will be an ideal response?
cos4 x = cos2 x cos2 x = 
2 = 
(1 + cos(2x))2 = 
(1+ 2 cos(2x) + cos2(2x)) = 
= 
( 3 + 4 cos(2x) + cos(4x)).
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