$-25n\:+45n$

$\lim_{h\to0}\left(\frac{10^{\sqrt{x+h}}-10^{\sqrt{x}}}{h}\right)$

$-2\cos2x=2\sin x$

$\left(1282-144\right)-\left(41+12\cdot3\right)-\left(52+14\cdot2\right)$

$\frac{1}{sec\left(x\right)+cot\left(x\right)}$

$\log_{10}\left(2x-1\right)-2\log_{10}\left(2x\right)+\log_{10}\left(x\right)$

$x3times3xtimes\:3x$