$\left(2x+3\right)\left(3x-10\right)$

$\sec^2\left(a\right)+\csc^2\left(a\right)\sec^2\left(a\right)\csc^2\left(a\right)$

$\frac{4^5+4^5+4^5+4^5}{4}$

$y'=12x$

$\tan\left(51\right)+\tan\left(6\right)-\tan\left(51\right)\cdot\tan\left(6\right)$

$\int\frac{1}{x^5\sqrt{7x^2-4}}dx$

$\lim_{x\to1}\left(\frac{x^2-2x-3}{x+1}\right)$