p(x)=sin-x3
p(x)=sin^3(x)-3sin(x)cos^2(x)
p(x)=sin(x)(-(2cos(2x)+1))
p(x)+sin(3x)=0
d/dx(-sin(3x))=-3cos(3x)
p(x)=sin-x3
p(x)=sin^3(x)-3sin(x)cos^2(x)
p(x)=sin(x)(-(2cos(2x)+1))
p(x)+sin(3x)=0
d/dx(-sin(3x))=-3cos(3x)