$\frac{1}{2xy^{2}}-\frac{1}{2x^{2}y}+\frac{3}{8xy}$

$\frac{2}{2x-3}=\frac{3}{3-2x}$

$-4x^2-3xy+7+4x^2-5xy-3$

$\left(m^x+n^{x+1}\right)^2$

$\frac{\left(3x^{2}\right)\left(3x^{-1}\right)^{2}}{\left(12y^{3}\right)\left(5y^{-1}\right)}$

$\tan\left(x\right)=-\frac{5}{3}$

$12x^3+18x$