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OpenStudy (onepieceftw):
Find all the solutions for: cos^2 x + 2cos x + 1 = 0
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OpenStudy (onepieceftw):
I have it factored to (cos x + 1)(cos x + 1) Just not sure how to continue.
OpenStudy (dayakar):
your solution is correct cosx+1 =0 cos x = -1
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