4cos²x + cosx = 0 and 2sin²x - sinx - 1 = 0 thanks
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Originally Posted by gracey 4cos²x + cosx = 0 and 2sin²x - sinx - 1 = 0 thanks Think of these as "polynomials". For , let . From that, you will get . Factor and solve that for u, then plug back in for u. Take the same approach for the second problem.
First convert them to quadratic functions. Let 1. 2. ,
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