$\left(4.5a+3.3b-1.2\right)+\left(-2.5a+2b+5.3\right)$

$\int_m^{\sqrt{3}}\left(\frac{x}{\sqrt{3-x^2}}\right)dx$

$5x^2=18+x$

$\lim_{x\to\frac{\pi}{4}}\left(\frac{tanx-cotx}{2x-\frac{\pi}{2}}\right)$

$x^2+7^2+10$

$4-\left(-41\right)$

$-6\left(12-5\right)-3\left(5-3\right)$