Question

sin3x is equal to.............​

Answer 1

Answer:

3sin(x)−4sin³(x)

Step-by-step explanation:

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Answer 2

Answer:

3 Sinx - 4$Sin^{3}$x

Step-by-step explanation:

Sin3x = Sin(2x+x)

= Sin2xCosx + Cos2xSinx

= 2Sinx cosx cosx + (1 - 2$Sin^{2}$x) Sinx

=2Sinx$Cos^{2}$x + Sinx - 2$Sin^{3}$x

=2sinx(1 - $Sin^{2}$x) + Sinx - 2$Sin^{3}$x

=2Sinx - 2$Sin^{3}$x + Sinx - 2$Sin^{3}$x

=3 Sinx - 4$Sin^{3}$x