Смотри здесь! Графики на картинке)
(2c + d - c - 2d )(2c + d + c + 2d) * 3cd =
= (c - d) (3c+3d) * 3cd = (c - d)(c + d)*9cd = (c²-d²)*9cd =
9c³d - 9cd³
2x^2+3x-10x-15-(16-x^2)-2x-5=0
2x^2+3x-10x-15-16+x^2-2x-5=0
3x^2-9x+36=0
Разделем все на 3
x^2-3x+12=0
<span>sin(L-3P/2)= -sin(3P/2-L)=cos
tg(P/2-L)=ctg
cos(P/2-L)=sin
</span>sin^2(L+P)=(-sin)^2=sin^2 так как sin(L+P)= -sin
sin(L-3P/2)*tg(P/2-L)*cos(P/2-L)+sin^2(L+P)= cos*ctg*sin+sin^2 =cos*cos/sin*sin+sin^2 = cos^2 + sin^2 =1