$36x^2+48x+20$

$x^8-49y^2$

$\frac{d}{dx}\left(\frac{1}{2}e^{\frac{x}{10}}\right)$

$x^2-\left(\frac{12}{9}\right)x+\left(\frac{16}{9}\right)$

$\frac{\sec\left(y\right)-\cos\left(y\right)}{\sin\left(y\right)}$

$3x\left(x-9\right)-2\left(x-9\right)$