$\frac{\left(3^{7}\cdot4^{7}\right)\left(2\cdot5\right)^{-3}\left(5^{2}\right)}{12^{7}\cdot5^{-1}\cdot2^{-4}}$

$7x-4x+y^3+x^3+7y^3+6x^3$

$2\left(1-\cos^2\left(x\right)\right)+cos^2x=1+sen^2x$

$x^2+30+15$

$-15ab\:+12ab\:-\:9ab\:+4ab$

$\left(\frac{10}{2}m^4\right)\left(\frac{4}{3}m\right)$

$\lim_{x\to0}\left(\frac{t-1}{t^2-1}\right)$