$\lim_{x\to0}\left(\frac{tan\left(3x^2\right)+sin^2\left(8x\right)}{x^2}\right)$

$\frac{dy}{dt}+2\cdot y\left(t\right)=3$

$\int9t\:cos\left(t\right)dt$

$6y^2+17y+12$

$\cos\left(\frac{\pi}{9}+\frac{\pi}{4}\right)+\frac{2}{3}\cos\left(\frac{13\pi}{36}\right)$

$82a+2$

$144x^2+6x^2+\frac{1}{16}$