import sympy as sp
from IPython.display import display

a,x = sp.symbols('a x',real=True)
eq=[2*x/(x**2+4),sp.tan(x),x*sp.sin(x),x*sp.log(x),
    sp.log(x),sp.log(x+1),
    (2*x**2-1)/(x+1),1/(x**2-1),(sp.cos(x))**3]
for f in eq:
    display(sp.Eq(sp.Integral(f, x), 
            sp.simplify(sp.Integral(f, x).doit())))