$-2a^3b^2-15a^3b^2$

$\frac{\sec\left(a\right)^2}{1+\sec\left(a\right)}$

$\int\frac{x^2-5x-16}{x+2}dx$

$\left(5y^3+2y^2\right)\left(25y^6+10y^5-4y^4\right)$

$0.4901\times10^8$

$\left(2x-3\right)\cdot\left(2x-3\right)\cdot\left(x+1\right)$

$\left(2xy\right)dy=\left(y^2+1\right)dx$