$\int x^2e^xdt$

$\left(-38\right)\cdot7+100\cdot38$

$\left(\frac{x^2}{x+6}\right)+\left(\frac{4x}{x^2-36}\right)$

$3ab.\left(7a^2b-5ab^3\right)$

$\left(3x+2y\right)^2\left(3x-2y\right)^2\:$

$y\cdot sen\left(x\right)\cdot e^{\cos\left(x\right)}\cdot dx+y-1\cdot dy=0$

$\left(9x^3a^3-45x^4a^2+36x^2\right)$