$\left(2m^2+3n^2+3mn\right)\left(2m^2+3n^2-3mn\right)$

$5+y=-6$

$\frac{dy}{dx}=3x\sec\left(5y\right)$

$25-81y^6$

$25a^4-60a^2+36$

$8-7\cos\left(x\right)=6\sin^2\left(x\right)$

$\left(\sin\left(x\right)+\cos\left(x\right)\right)^2-1=2\sin\left(x\right)\cos\left(x\right)$