$sin\left(10x\right)cos\left(6x\right)=\frac{\left(cos\left(16x\right)-cos\left(4x\right)\right)}{2}$

$\frac{dy}{dx}+2y=e^{2x}$

$\left(\frac{x^3y^2}{3}+\frac{2a^3}{5}\right)\:\left(\frac{x^3y^2}{3}-\frac{2a^3}{5}\right)$

$\frac{25a^3}{5ab}$

$\lim_{x\to0}\left(\frac{tan\left(x-1\right)}{x-1}\right)$

$16a^2-9b^4$

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