Mathematics, 28.01.2021 01:20 gabby640

Find all solutions in the interval [0,2pi] cos^2x + 3 cos x + 1 = 0 a) x = 2pi
b) x = pi
c) x = pi/4 , 7pi/4
d) x = pi/2 , 3pi/2

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Find all solutions in the interval [0,2pi] cos^2x + 3 cos x + 1 = 0 a) x = 2pi
b) x = pi