Q24 of 35 Page 3

sin2x + 2sin4x + sin6x = 4cos2x sin4x


L.H.S = sin2x + 2sin4x + sin6x
         = 2sincos + 2sin4x
         = 2sin4xcos2x + 2sin4x
         = 2sin4x(cos2x + 1)
         = 4sin4xcos2x
         = 4cos2xsin4x
R.H.S 

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