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  • 29-07-2016
  • Mathematics
Answered

Prove that sin θ - sin θ•cos2 θ = sin3 θ. Show all works of the equation.

Verified Answer :

Anonymous Anonymous
  • 05-08-2016

I used x instead of Ф.

\(sinx- (cos x)^{2} *sinx= (sin x)^{3}\)

\(sinx(1-(cos x)^{2})=(sin x)^{3}\)

You use the fundamental formula sin^2x+cos^2x=1

sinx*sin^2x=sin^3x
sin^3x=sin^3x

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