$\lim_{x\to1}\left(\frac{\arctan\left(x\right)}{\arccos\left(x\right)}\right)$

$6.39\cdot0.1$

$\left(9x^2y-8xy^2-3\right)\cdot dx+\left(3x^3-8x^2y+2\right)\cdot dy=0$

$5+3-16+15$

$\sqrt[3]{32b^2}+5\sqrt[6]{16b^4}-7\sqrt[9]{64b^6}$

$f\left(x\right)=x^3+2x^2$

$\frac{4+2}{2}-\frac{0.5}{2}$