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).
Mathematics
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