$\lim_{b\to2}\left(\frac{1}{\left(b-2\right)}\right)$

$\left(x^3-0.3\right)^2$

$\left(5a^2-12b\right)\left(5a^2+12b\right)$

$20+90+51\cdot$

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

$\int_0^{\pi}\left(2sec^2\left(\frac{t}{4}\right)\right)dt$

$\frac{dy}{dx}=\frac{1}{x}+\cos\left(2x\right)$