Ршить систему и если система имееи решение, то пересекаются
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
В)5х-1+15х+10=6х+8
5х+15х-6х=8+1+10
14х=19
Х=3.1
Г)44-30-40х=35х+14
40х-35х=14-44-30
5х=-60
Х=-60:5
=-12
Х=1.3
Г)44-30-40х=35х+14
40х-35х=14-44-30
5х=-60