(2sin5x.cosx)(2cos5x.sinx)
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2sin5x.cosx.2cos5x.sinx
=(2sin5x.cos5x)(2sinx.cosx)
=sin(2×5x)sin (2×x)
=sin10xsin2x
=(2sin5x.cos5x)(2sinx.cosx)
=sin(2×5x)sin (2×x)
=sin10xsin2x
hafeezhtech:
in your second step how did you get (2sinx.cosx)
just rearranged
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