$\frac{\left(xy^{-5}\right)^{-5}}{\left(x^{-5}y\right)^{-6}}$

$\frac{\left(x-1\right)\left(x+9\right)}{x^2-4}$

$\left(5x^3+6m^{4g}\right)^2$

$\lim_{x\to\infty}\left(\frac{4x^2+3x+1}{\sin\left(2x\right)}\right)$

$y=\frac{2}{3}x+7$

$45^{\circ}\:cos25^{\circ}+cos\:45^{\circ}sin\:25^{\circ}$

$8y=456$