$\frac{dp}{dt}=\frac{7}{900}p\left(9-p\right)$

$\lim_{x\to\infty}\left(\frac{4x+\sqrt{5-11x}}{\sqrt{x^2+8}-3}\right)$

$\frac{2x^2-x-4}{x-1}$

$\lim_{x\to-3.01}\frac{\tan\left(x+3\right)}{x+3}$

$\cos\left(\frac{\pi}{2}-x\right)=\frac{2}{7}$

$a^7\left(m-n\right)-4\left(m-n\right)$

$\frac{\csc\left(x\right)}{\csc\left(x\right)-\sin\left(x\right)}-1$