$18x^3-12x^2+8x$

$\left(2y-4\right)\left(2y-5\right)$

$-\frac{5}{39}sin5xcos8x+\frac{8}{39}sin8xcos5x$

$\frac{1}{8}.3^0+\left(\frac{5}{16}\right)^0-\left(4\right)^{-1}+\left(2\right)^{-3}$

$-4\cos\left(x\right)+1=0$

$\left(\frac{\left(4x^{2}y^{3}\right)^{2}}{\left(2xy\right)^{3}}\right)^{2}$

$x^{-3}y^5$