$20x^2+15x$

$\frac{1}{sin\left(x\right)^2}-1=\frac{cos\left(x\right)^2}{sin\left(x\right)^2}$

$\left(\frac{2}{9}m^3c^4-\frac{3}{8}b^2f^5\right)\left(\frac{3}{8}b^2f^5+\frac{2}{9}m^3c^4\right)$

$\int x^2\cos\left(3x+\pi\right)dx$

$19g+25-19g$

$4x+4+-9x+12y-10y$

$\left(1-xy\right)^2$