Parametric equations

Yukina

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Joined
Jul 6, 2011
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5
A curve has parametric equations x=cos?+?sin?, y=sin?-?cos?, -2????2?.
Determine all points at which the curve has horizontal or vertical tangent lines.

Can any body help me, please??
 
Find dy/dtheta = 0 and dx/dtheta = 0. What does this provide?
 
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