Cos 4x = 1-8 sin²x cos²x
Answers
Answered by
0
cos4x=cos2(2x)
cos4x=1-2sin²2x
cos4x=1-2(sin2x)²
cos4x=1-2(2sinxcosx)²
cos4x=1-2(4sin²xcos²x)
cos4x=1-8sin²xcos²x
Similar questions