$\frac{2x^2}{5}.\left(x^3-3x^2+x-1\right)-3^3.\left(\frac{x^2}{2}-x+\frac{2}{3}\right)$

$\cot^2\left(x\right)=\frac{\cos^2\left(x\right)}{1-\cos^2\left(x\right)}$

$9n^2-42n+49$

$-215+418$

$x^2-8x+16\le0$

$\left(+64\right)-\left(-20\right)$

$\frac{dy}{dx}=\frac{y^{\ln\left(8e\right)}}{x^{\ln\left(2e\right)}}$