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Rezolvati ecuatia.
cos^2 x - 5 cos x + 6 = 0


Răspuns :

Combine like terms: 6 + -6 = 0 -6 + -5cosx + cos2x = 0
cos²x-5cosx+6=0
cos²x-3cosx-2cosx+6=0
cosx(cosx-3)-2(cosx-3)=0
(cosx-3)(cosx-2)=0
Si de aici avem cele doua solutii....