$\left(\frac{1}{64}m^9\right)+3\left(\frac{1}{16}m^6\right)\left(\frac{1}{3}n\right)+3\left(\frac{1}{4}m^3\right)\left(\frac{1}{9}n^2\right)+\left(\frac{1}{27}n^3\right)$

$12x+20$

$\lim_{x,y\to0,4}\left(2xy\right)^{xy}$

$\int\left(x^2-5\right)\cdot\cos\left(2x\right)dx$

$\left(784\cdot567\right)\cdot\left(4003\right)$

$\sin\left(5x\right)\sin\left(10x\right)-\cos\left(5x\right)\cos\left(10x\right)$

$\frac{25n^2}{16y^2}-\frac{4a^2}{9x^2}$