2.5-5sin^2(x)-5cos^2(x)+0.5
1) 2.5+0.5=3
2) sin^2(x)+cos^2(x), откуда
3-5(sin^2(x)+cos^2(x)) = 3-5 = -2
2.5-5sin^2(x)-5cos^2(x)+0.5
1) 2.5+0.5=3
2) sin^2(x)+cos^2(x), откуда
3-5(sin^2(x)+cos^2(x)) = 3-5 = -2