Question 1163520
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Point A = (cosθ,sinθ) is at the intersection of x2 +y2 = 1 and a ray starting at the origin that makes an angle, θ, 
with the positive x-axis. The ray starting at the origin through point P makes an angle of 2θ with the positive x-axis.
(a) Explain why P = (cos 2θ, sin 2θ).
(b) Reflect B = (1,0) over the line CA to get an equivalent
form of the coordinates of P written in terms of cos θ and sin θ.
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The author of this post mentioned/introduced point 'C' (by saying about line CA),

but forgot to define this point (and this line).


As a result, the posted problem is fatally defective and is only good to throw it to a garbage bin.