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  • 29-07-2016
  • Mathematics
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Prove that sin θ - sin θ•cos2 θ = sin3 θ. Show all works of the equation.

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Аноним Аноним
  • 05-08-2016
I used x instead of Ф.

[tex] sinx- (cos x)^{2} *sinx= (sin x)^{3} [/tex]

[tex]sinx(1-(cos x)^{2})=(sin x)^{3}[/tex]

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

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