$\left(y\:+\:4\right)^2-\:2\left(y\:+\:4\right)^2$

$\left(secx+tanx\right)\left(1-sinx\right)$

$\frac{dy}{dx}=-10^{-6}\left(x^2-81\right)$

$\int_0^a\sqrt{a^2-x^2}\:dx$

$3xc\left(4a-5b\right)+5mc\left(5b-4b\right)$

$\frac{d^2}{dx^2}\left(bx^2-a^2y^2=a^2b^2\right)$

$\left(x^{a+1\:}+\:y^{b-2}\right)^2$