$16m^8-64m^5n\:\:\:64m^2n^2$

$\left(\cos\:\left(\sin\:\left(9.5\right)\right)\cdot\:\cos\:\left(9.5\right)\right)+\left(-\sin\:\left(\cos\:\left(9.5\right)\right)\cdot\:-\sin\:\left(9.5\right)\right)$

$\frac{1-sen^2a}{cos\:a}=cos\:a$

$\lim_{x\to\infty\:}\left(\frac{x^3-2x+1}{4x+9}\right)$

$9x^2y-6xy$

$\frac{dy}{dx}=\frac{2x\left(y-1\right)}{x^2+3}$

$\left(a^2+b^3-1\right)\left(a^2-2b+1\right)$