$45x+x+2x^2$

$5x-2^2$

$43-29-65+83+78$

$\left(1+\cos\left(b\right)\right)\left(1-\cos\left(b\right)\right)=\sin^2\left(b\right)$

$\frac{a}{3}\sqrt{2xy}+\frac{a}{2}\sqrt{2xy}-\frac{a}{4}\sqrt{2xy}$

$\lim_{x\to1}\left(x\left[y\left(x-1\right)+1\right]^2-2+x^2\left[y\left(x-1\right)+1\right]\right)$

$\int_0^{\infty}\left(\frac{1}{x^2+6x+10}\right)dx$