Find all solutions of the equation in the interval [0,2pi) cos^2x+2cosx-3=0

Find all solutions of the equation in the interval  [0,2pi)   cos^2x+2cosx-3=0
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1 Answer

kosine^2(x) + 2*kosine(x)=3 is true if kosine(x)=1

kosine(x)=1 at x=0
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