Let's do some calculus using Sage.
The derivative of $\sin(x)$ is:
sage: diff(sin(x), x) cos(x)
The derivative of $\log(x) + x^2$ is:
sage: diff(log(x) + x^2, x) 2*x + 1/x
Sage can integrate $\int x^3 dx$:
sage: f = x^3 sage: f.integral(x) 1/4*x^4
Let's compute $\int x \sin(x^2) dx$:
sage: f = x*sin(x^2) sage: integral(f,x) -1/2*cos(x^2)