$\frac{d}{dx}\left(\frac{x^7\sqrt{6-x}}{sec^3x}\right)$

$\left(n-2t\right)\left(n+5t\right)$

$9^{10}\cdot9^2$

$\left(\frac{cos2x}{sen2x}\right)^2+tan^245^{\circ}$

$4x^4-4x^2+1$

$4xdy=\left(y^2+xy^2\right)dx$

$\left(a-x\right)^2+\left(x-y\right)^2+\left(x^2-y^2\right).\left(m+x-n\right)$