$\left(30+6\right)+\left(\sqrt{25}+4-\sqrt{9}\right)$

$\frac{d}{dx}2^x+x^2$

$y'=3y-4x$

$\lim_{t\to0}\left(\frac{6^t-2^t}{4t}\right)$

$-16x^2+64x$

$\tan^2\left(a\right)\left(1+\cot^2\left(a\right)\right)=\frac{1}{\cos^2\left(a\right)}$

$\frac{dy}{dx}\left(\tan\left(xy\right)-\sin\left(x-y\right)=x-2y\right)$