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

$\lim_{x\to-5}\left(\frac{1}{25}x^3\:-\:10x\right)$

$\int\sin\left(x\right)^5cos\left(x\right)^8dx$

$-8\:x\:2$

$16\int e^{\tan\theta}\sec^{2}\thetad\theta$

$\frac{sin\left(x\right)-cos\left(x\right)}{sin\left(x\right)}=\frac{cos\left(x\right)-sin\left(x\right)}{cos\left(x\right)}$

$4-108x^2+121x^1$