$2sin3x=1$

$\left(\sqrt{2x+1}\right)^2-\left(5\left(\sqrt{2x+1}\right)\right)+4$

$5x^2+30x+45$

$4a^2+15+9$

$\frac{\left(x-1\right)^2}{x+3}$

$\frac{dy}{dx}=-\frac{1}{5\:}\sqrt{y}$

$\frac{d}{dx}\left(\frac{\sin^4\left(x\right)\tan^6\left(x\right)}{\left(x^2+1\right)^2}\right)$