I'm trying to find the derivative of an equation and plotting.

so the data i was given was to plot the equation with respect to x and the derivative in the same graph but with dashed line. include legend as well plz. x=[-4<x<4] f(x)=x^3-2x^2-10sin^2(x)-e^0.9x

syms x x=-2:0.01:4; f=(x.^(3))-(2*x.^(2))-(10*sin(x).^2)-(exp(0.9*x)); df= diff(f,x); plot(x,f,'-') plot(x,df,'--'); legend('f(x)','f_(x)')