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    How can I solve a problem with two equations in two unknowns using trigonometry?

    Hi, I have a problem that arose in one of my courses that I've gotten stuck on. I reduced it to two equations in two unknowns but can't get any further. I've apparently forgotten all the trigonometry I used to know. C = Acos(x) + Bcos(y) 0 = Asin(x) + Bsin(y) where A,B,C are known but...
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