Question 1163601
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The coordinates of *[tex \Large P] are *[tex \Large \(\cos2\theta,\sin2\theta\)] if and only if *[tex \Large P] lies on the circle *[tex \Large x^2\,+\,y^2\ =\ 1].


Since you didn't specify that *[tex \Large P] is on the unit circle, you cannot prove the assertion in part (a).


In part (b) you have the same problem exacerbated by the fact that you don't specify the location of point *[tex \Large C]


If you want help with this question, repost it including all of the relevant information.
								
								
John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
<img src="http://c0rk.blogs.com/gr0undzer0/darwin-fish.jpg">
*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \  
								
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