(1-sin^4(α)-cos^4(α))/cos^4(α)=(sin^4(α)+cos^4(α)+2sin^2(α)*cos^2(α)-(sin^4(α)+cos^4(α)))/cos^4(α)=(2sin^2(α)*cos^2(α))/cos^4(α)=2sin^2(α)*cos^2(α)/(cos^(α)*cos^2(α))=2sin^2(α)/cos^2(α)=2tg^2(α)
2x^3 + x^2 - 4 x + 3 : 2x +1 = x^2 ( 2x +1) - 4x-3: (2x+1) = x^2 - 4x +3 =0
и по формуле Виета будут такие корни:
х= 1,х= 3.
36+4+95=135/3=45
Вот так))