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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