Integrate[ x^2, x ]

Integrate[ x^2, {x,0,2}]

Integrate[ Sin[x]*Sec[x]^2, x ]

Integrate[ x^3-x^2,{x,1,2}] + Integrate[ x^2-x^3,{x,0,1}]

Integrate[ 3 - (x^2-1), {x,-2,0}] + Integrate[ x - (x^2 - 1), {x,0,1}]