Posted by Anonymous on Saturday, February 4, 2012 at 9:43pm.
If tan theta = sin theta, and theta is greater than or equal to 0 and less than or equal to 2 pi. find cos theta and what is theta

trig  Reiny, Saturday, February 4, 2012 at 10:18pm
tanØ = sinØ , 0 ≤ Ø ≤ 2π
sinØ/cosØ = sinØ
sinØ = sinØcosØ
sinØ  sinØcosØ = 0
sinØ(1  cosØ)=0
sinØ = 0 or cosØ = 1
Ø = 0, π , 2π or Ø = 0 , 2π
Ø = 0 , π , 2π
then if Ø = 0 or 2π , cosØ = 1
if Ø = π , then cosØ = 1
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