anonymous
  • anonymous
Prove: sin θ - sin θ•cos2 θ = sin3 θ. You must show all work.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
idk even where to begin
myininaya
  • myininaya
Just thought Maybe you can take the right hand side and show the left hand side Try to play with this thought: sin(3x) is sin(2x+x)
myininaya
  • myininaya
That should be a hint to use the sum identity for sin

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Idealist10
  • Idealist10
Memorize the identities for cos 2*theta
myininaya
  • myininaya
Though I could be wrong but I don't think this is an identity.
myininaya
  • myininaya
One way to find out is to find a counterexample
myininaya
  • myininaya
try theta=pi/2 does not work
Idealist10
  • Idealist10
sin(2x)=2*sin(x)*cos(x)
Idealist10
  • Idealist10
cos(2x)=2cos^2 (x)-1
myininaya
  • myininaya
Maybe the problem has been written incorrectly.
myininaya
  • myininaya
Unless the instructions say to: Prove if true and give a counterexample if false. If so then I have accidentally given you the answer.
Idealist10
  • Idealist10
cos(2x)=1-2sin^2 (x) so what's sin(x)*cos(2x)?

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