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rezolvati ecuatia omogena: -3sin^2 x-2sinx cosx+cos^2 x=0

Răspuns :

Impartim ecuatia la cos^2 x, notam tg x =t si avem:

[tex]-3t^2-2t+1=0[/tex]  cu solutiile:

[tex]t_1=-1;\ t_2=\dfrac13[/tex]

[tex]tg x=-1\Rightarrow x_k=-\dfrac{\pi}{4}+k\pi;\ k\in Z[/tex]

[tex]tgx= \dfrac13\Rightarrow x_k=arctg\dfrac13+k\pi; k\in Z[/tex]