$\left(\frac{2}{3}a+\frac{5}{4}b\right)\left(\frac{2}{3}a-\frac{5}{4}b\right)$

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

$3y^2-2y-6$

$x^2-4x+0$

$y-35=-123$

$\lim_{x\to\frac{1}{2}}\left(\frac{x\cos\left(x\right)}{e^x-\sqrt{e}}\right)$

$sin\left(tan^{-1}\left(\frac{x}{2}\right)\right)$