trig

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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 -

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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