$\frac{15x^2+x^2-2}{3x^2-1}$

$\int\left(140\cos\left(20x\right)\right)dx$

$3a+5ab^2c\left(3a-5b^2c^2\right)$

$x^3\left(x^2y^2\right)$

$\left(-6+i\right)\left(-5-i\right)$

$\frac{1+\cos\:\left(\theta\:\right)}{\cos\:\left(\theta\:\right)}=\frac{\left(\tan\:\left(\theta\:\right)\right)^2}{\sec\:\left(\theta\:\right)-1}$

$xy''+\left(x-1\right)y'-y$