$\frac{dt}{dp}=rp\left(1-\frac{p}{k}\right)$

$\frac{1+sin\:x}{\cos\left(x\right)}-\frac{\cos\left(x\right)}{1+\sin\left(x\right)}=2\:sec\left(x\right)$

$\frac{dy}{dx}\left(\frac{-1}{10}\right)\sqrt{y}$

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

$\frac{1}{\left(x-2\right)}+\frac{1}{\left(x+2\right)}=\frac{4}{\left(x^2-4\right)}$

$\lim_{x\to\pi}\left(\frac{sinxcosx}{x^2-\pi\:^2}\right)$

$\frac{440}{4}$