$181x^2-362^2$

$y^4-6y^2z+25y^4$

$\frac{d^2}{dx^2}\left(3\cot\left(x\right)\right)$

$\frac{6\left(-1\right)^2-2}{12\left(-1\right)^2+12\left(-1\right)}$

$\lim_{x\to\infty}\left(x\:sin\:\frac{7}{x}\right)$

$\left(\frac{3}{4}x+5\right)^2$

$\frac{dy}{dx}=y\sqrt[2]{y^2-1}$