$\lim_{t\to\infty}\left(\frac{e^t+t^2}{e^2-t}\right)$

$2\sin\left(\frac{1}{4}x\right)-1=0$

$\left(3x+2y+c^4\right)^3$

$\int_{\frac{\pi}{6}}^{\frac{\pi}{4}}\left(8tanx\left(secx\right)^4\right)dx$

$\left(3x^2+2xy\right)dx+\left(x^2-6y^2\right)dy=0$

$\frac{p}{p}$

$f\left(x\right)=21x^2-2x$