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OpenStudy (anonymous):
Find the solutions of the given equation in the indicated interval. 20 (cos(x))^2 + cos(x) − 1 = 0, [0, π]
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OpenStudy (freckles):
you can factor
OpenStudy (freckles):
20u^2+u-1 what two numbers multiply to be -20 and add up to be 1?
OpenStudy (anonymous):
-4 and 5
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