$\left(1-7\right)\cdot\left(-2+8\right)-1$

$\frac{d}{dx}\left(x^2-3xy+2y^2+4=0\right)$

$\int\sqrt[5]{x^8}-\sqrt{x^3}dx$

$\frac{sin\left(\frac{\pi}{2}-x\right)}{sinx}$

$\frac{-24x^2y}{8xy}$

$-22-\left(1.5\right)$

$\lim_{x\to infinity}\left(\frac{10\log2\left(x\right)}{\sqrt[10]{x}}\right)$