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# Eliminating theta watch

1. x = sin theta

y = sin2 theta

y=2sin theta X cos theta

now my question is how do i go about eliminating the cos theta from y?
2. (Original post by T.P.D-L)
x = sin theta

y = sin2 theta

y=2sin theta X cos theta

now my question is how do i go about eliminating the cos theta from y?
Are you trying to find y in terms of x?

Does that help?
3. ok, taking what you just said, i've ended up with

y^2 = 4x^2 - 4x^4

y = 2x - 2x^2

Would you agree?

Thanks

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Updated: November 13, 2008
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