$\left(6b+2c\right)\left(5b-2c\right)$

$60p-75q$

$\frac{d}{dx}\left(cos\left(x^2\right)+4y^2=4sen\left(y^2\right)\right)$

$\frac{x^4y^4\:.\:2x^3y^3}{\left(x^4y^0\right)^2}$

$\frac{d}{dy}\left(x^8\:+\:3xy^7\right)$

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

$\left(3n\cdot4n^3\cdot n^2\right)^2$