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OpenStudy (anonymous):
how do you solve sin^2x+2cosx=2?
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OpenStudy (accessdenied):
If we changed sin² x into terms of cosine, we could make a substitution that u = cos x. Then solve the resulting quadratic equation for u, and then solve for x working backwards: cos x = u
OpenStudy (accessdenied):
The solutions of the quadratic in u are the values that we set cos x equal to.
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