$\frac{d}{dt}\left(x=80\cdot e^{\frac{y}{15}}\right)$

$\lim_{x\to\pi}\left(\left(\pi-x\right)\cot\left(x\right)\right)$

$-15m^3n+12m^2n$

$-30+15r$

$log2\left(log2\left(log2x\right)\right)=0$

$4a+b-2a^2+b$

$5sin^2x-6\csc^2\left(x\right)+5\cos^2\left(x\right)+6\cot^2\left(x\right)$