$\lim_{x\to0}\left(\frac{\sqrt{5}\cdot sin\left(2x\right)+2\cdot x\cdot sin\left(4\cdot x\right)+x\cdot cos\left(2\cdot x\right)}{x}\right)$

$\left(10x^3yz^2\right)\left(-2xy^5z\right)$

$\left(4x^2y+9m^3\right)^2$

$\left(\frac{1}{2}x-\frac{4}{7}\right)^2$

$10x^2-3x-x^2+8x$

$ydy-6xdx=0$

$-0.05+15.22$