$\left(6mn^4-3m^5n\right)^2$

$\left(7x-12\right)\left(7x+12\right)$

$x^5-27x^3+120x=14x^2$

$\frac{\left(sin\:x\right)}{1-cos\:x}+\frac{\left(sin\:x\right)}{1+cos\:x}=2cscx$

$6x-1>0$

$\left(n+y\right)\left(n^2-ny+y^2\right)$

$\frac{-4\sec\left(x\right)}{-\sin\left(x\right)}$