Y=2.V2.sin2x.cos2x -x= V2. sin 4x - x
y´= 4.V2.cos4x -1, k=tg alfa = y ´
y´= 3, 4.V2.cos4x-1=3, 4.V2.cos4x=4,V2.cos4x=1
cos 4x = 1/V2 = V2/2
a)4x=pí/4 + 2k.pí, x = pí/16+k.pí/2
b)4x=7/4pí+2kpí,x=7/16pí+ k.pí/2
k=0,1,-1,2,-2,3,-3,.........
А8= -9
a10= -3
a10=a8+2d
d=(a10-a8)/2=(-3+9)/2=3
a8=a1+7d
a1=a8-7d= -9-21= -30
(y-4)(y+2)-(y-2)² = у^ +2y -4y -8 - (y^ -4y +4) = y^-2y - 8 - y^ + 4y - 4 =2y-12;^ - это квадрат