<span>4 (у+2)=-2
4y+8</span><span>=-2
4y</span><span>=-2-8
4y</span><span>=-10
y</span><span>=-10/4
y</span>=-5/2<span>=-2,5</span>
{2х-у^2=5
{х+у^2=16
3х=21
х=7
подставляем
7+у^2=16
у^2=11
1) y = CosxCos7x - SinxSin7x = Cos(x + 7x) = Cos8x
y' = (Cos8x)' = - Sin8x * (8x)' = - 8Sin8x
2) y = CosxCos7x + SinxSin7x = Cos(x - 7x) = Cos(- 6x) = Cos6x
y' = (Cos6x)' = - Sin6x * (6x)' = - 6Sin6x
3) y = Sin7xCosx - SinxCos7x = Sin(7x - x) = Sin6x
y' = (Sin6x)' = Cos6x * (6x)' = 6Cos6x
4) y = Sin7xCosx + SinxCos7x = Sin(7x + x) = Sin8x
y' = (Sin8x)' = Cos8x * (8x)' = 8Cos8x