How to prove?
All Ive got so far is
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Let's see, cos(2 * 0) + cos(0) = 2. Hmm...
It should read "solve", and we've already addressed this (7 minutes ago) at mymathforum!
I'm ok with you replying in either place... Obviously
Now substitute to get a quadratic equation in , which you will be able to solve.
Yeah, I said that already!
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