$\frac{\tan\left(x\right)-\sin\left(x\right)}{1-\cos\left(x\right)}=\tan$

$\int\frac{5x}{\left(8-x^2\right)^3}dx$

$\lim_{x\to2}\left(\frac{x^2-2x}{x^2-4x+2}\right)$

$\log_{10}\left(a\right)=1.3$

$\lim_{x\to\frac{\pi}{2}}\left(1-tan\left(x\right)sec2x\right)$

$f\left(x\right)=tanx^2sec\:x$

$\lim_{z\to0}\left(\frac{\sin\left(z\right)}{z^2}\right)$