$144x^6-2560y^{24}$

$-3\cdot10^2x$

$\cos\:\left(x\right)\sin\:\left(x\right)\left(\frac{1}{\cos\:\left(x\right)}+\frac{1}{\sin\:\left(x\right)}\right)$

$\left(12-3\right)\cdot\left(4-5\cdot2\right)$

$\frac{1}{2}\infty^{\frac{-1}{2}}$

$2x+6\:\cdot\:5$

$3x^2+12x+81=15$