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OpenStudy (anonymous):
Cos^2x+2cosx+1=0
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jimthompson5910 (jim_thompson5910):
replace cos(x) with z to get this equation z^2 + 2z + 1 = 0
jimthompson5910 (jim_thompson5910):
Solve z^2 + 2z + 1 = 0 using any method (quadratic formula is the best in my opinion since it always works for any quadratic)
jimthompson5910 (jim_thompson5910):
once you have solutions for z, use them to solve for x
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