1.

Sin3x = 3 sin x-4 sin^3x​

Answer»

Step-by-step explanation:

sin3x=sin(2X+x)

=sin2xcosx+cos2xsinx

=2sinxcosxcosx+(1−2sin  2x)sinx

=2sinx(1−sin  2  x)+sinx−2sin  3  x

=3sinx−4sin  3X



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