$2c\cos\left(x\right)\sin\left(x\right)$

$\frac{2x^2+3x+1}{2x^2-x-1}$

$1,44\cdot50$

$\frac{3-\frac{1}{3x}x}{3\frac{1}{2}}\ge\frac{3x-\frac{5}{2}}{1-\frac{2}{3}}$

$\ln\left(x-8\right)=4$

$\frac{d}{dx}\left(e^x\sin\left(y\right)+e^y\sin\left(z\right)+e^z\sin\left(x\right)\right)$

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