$\lim_{x\to2.1}\left(\frac{x-2}{x^2+3x-10}\right)$

$\frac{dy}{dx}=e^{-16t}\:y\left(0\right)=3$

$27z^5-27z$

$\log\left(x\right)-\log\left(10\right)=14$

$\left(6\right)\left(y+4\right)\left(y\right)=840$

$\int\tan^3\left(12x\right)\sec^3\left(12x\right)\:dx$

$\cos\left(u\right)\left(1-\cos^2\left(u\right)\right)$