ed84c Posted October 11, 2007 Posted October 11, 2007 Theres a straight line (l) and a polar co-ord of a point A (p, alpha). The straight line passes through A and is perpendicular to OA. Ive got to prove rcos(theta - alpha) = p Any ideas where to start with this. I've got y = tan(alpha)x for OA.
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