$\int\left(\frac{e^{x^2}}{x^5}\right)dx$

$15x^2y^3-12xy^4+18x^3y$

$3e^{3-3x}-6=-31$

$tan\left(x\right)^2=\frac{sin\left(x\right)^2}{cos\left(x\right)^2}$

$m^2+3m+2$

$3\left(-2x^2-4x+5\right)+5\left(5x^2+4x-2\right)$

$\sec\left(a\right)\sin\left(a\right)\tan\left(a\right)$