sin(pi+x/6)=-sinx/6
y=-24sin(x/6)-5x+2
y'=-24cos(x/6)*1/6-5=-4cos(x/6)-5
y'(-2pi)=-4cos(-pi/3)-5=-2-5=-7
sin(pi+x/6)=-sinx/6
y=-24sin(x/6)-5x+2
y'=-24cos(x/6)*1/6-5=-4cos(x/6)-5
y'(-2pi)=-4cos(-pi/3)-5=-2-5=-7