$\frac{d}{dx}\left(x^2-y^2=-7xy\right)$

$\int\frac{e^{2t}}{\left(e^{2t}-\pi\right)}dt$

$( 6 x ^ { 4 } y ^ { 5 } ) ^ { 2 }$

$-3x^2+12=-5x^2+20$

$-\left(\frac{3}{2}\cdot\:\frac{4}{3}\right)\frac{3}{4}\left(\frac{16}{3}:2\right)$

$\left(x+y+2\right)^3$

$9\sin\left(x\right)^2-cosx^2=7$