$\left(1.01518\right)^{64}$

$\frac{5}{6}\left(x^2\right)-\frac{2}{3}\left(y^2\right)+\frac{3}{4}\left(xy\right)-\frac{1}{2}\left(xy\right)-\frac{1}{6}\left(x^2\right)+\frac{1}{8}\left(y^2\right)+\frac{5}{6}\left(xy\right)-\frac{1}{3}\left(x^2\right)+\frac{1}{4}\left(y^2\right)$

$6.5\left(4x+5\right)-6\left(2.5x+1.5\right)$

$\left(x\:+\:2\right)^4$

$\int\frac{\left(x^2\right)}{\left(x+7\right)^9}dx$

$y'=\frac{y^2-x^2}{2xy}$

$21+2x-3x=0$