$-3x^2-24x-51=0$

$\left(5+\sqrt{2}\right)\left(5-\sqrt{2}\right)=23$

$\lim_{x\to\infty}\left(x\cos\left(\frac{1}{x}\right)\right)$

$\lim_{t\to0}\left(\frac{sin^2t}{cost-1}\right)$

$\frac{\cos\left(x\right)\cdot\cos\left(y\right)-\sin\left(x\right)\cdot\sin\left(y\right)+\sin\left(x\right)\cdot\sin\left(y\right)}{\cos\left(x\right)\cdot\sin\left(y\right)}$

$\sqrt[4]{\frac{1}{3}}.\sqrt[4]{48}$

$\left(3x^4-2y^6\right)^2$