The way I did it was representing 7 sinx + 4 cosx as a single sine function.
Once I did that, I just equated that to 8, and solved for x.
hmm. what i did was:
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i think by now you see where i am going with this. simplifying what i have above leads to a quadratic equation in cosine, and dealing with quadratics is easy
Originally Posted by ThePerfectHacker
Let then,
Thus,
Now you can solve for .
interesting solution
Last edited by ThePerfectHacker; Oct 31st 2007 at 07:37 PM.