[tex] \frac{ sin^{2} \alpha -3 cos^{2} \alpha }{2 sin^{2} \alpha + cos^{2} \alpha } [/tex]
если [tex]tg \alpha =3[/tex]
если [tex]tg \alpha =3[/tex]
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=(tg^2a-3)/(2tg^2a+1)=(3-3)/(2*3+1)=0