$\lim_{x\to4}\left(\frac{12x-60}{x^2-6x+5}\right)$

$\sqrt { 3 x + 4 } = 5$

$\frac{e\left(x\right)-\left(\left(x+1\right)\cos\:\left(kx\right)\right)}{\left(x\right)\sin\left(kx\right)}$

$77+88$

$\left(t-1\right)\left(t-4\right)\left(t-4\right)$

$\frac{d}{dx}\left(ln\left(1+tan\left(\frac{x}{2}\right)\right)-ln\left(1-tan\left(\frac{x}{2}\right)\right)\right)$

$\int_0^{\frac{\pi}{6}}tan\left(2x\right)^5dx$