$\int\frac{\left(e^x\right)}{e^{2x}+3}dx$

$\frac{\tan\:^2\left(x\right)}{\sec\:\left(x\right)}=\sec\:\left(x\right)-\cos\:\left(x\right)$

$\frac{y-2x}{20x}-\frac{x-3y}{24y}$

$4x-2x>4x+x+1$

$\left(x+1\right)^2-\left(x+1\right)$

$\left(3x^2-4y^3\right)\left(-5+2xy-6x\right)$

$\int\left(-\frac{2x^3}{\sqrt{x^2+9}}\right)dx$