$\left(\frac{5}{6}y^a+\frac{2}{3}x^b\right)^2$

$\frac{\left(\frac{40}{3}\right)}{\left(\frac{8}{3}\right)}$

$\frac{sin\left(x\right)}{1-cos\left(x\right)}-cot\left(x\right)$

$\frac{d^2}{dx^2}\left(\frac{1}{1+x^2}\right)$

$\frac{d}{dx}e^{2t-1}$

$3ty'+7y=4t^2-3t+22$

$11d+5f-21d+5-8$