$\left(\frac{5}{6}+\frac{5}{4}\right)x\left(\frac{7}{10\:}-\frac{1}{4}\right)$

$6.8+3.125+1.6$

$\frac{dy}{dx}\left(y=ln\left(cotx\right)\right)$

$\lim_{x\to0}\left(x^2+1\right)^{\frac{1}{x\cdot\sin\left(x\right)}}$

$80\cdot25$

$x-2\left(x+3\right)>-5+19x$

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