$\lim_{x\to0}\left(\frac{-5x}{\cos\left(3x\right)-\cos\left(8x\right)}\right)$

$\frac{72.89}{4.45}$

$\left|-9\right|-\left|-5+7\right|+\left|12\right|$

$\frac{\csc\left(x\right)}{\cot\left(x\right)}\cdot\sin\left(x\right)$

$\sqrt[3]{\frac{27x^3y^2}{8x^5y}}$

$12^2+8^2$

$f\left(x\right)=\frac{5x}{x^{2}+1}+3\sqrt{4x+1}-11$