$2^2+2ab+-3^2$

$\left(2s^2-5t\right)\left(2z^2+t\right)$

$\left(18a^4b^3+4c^8\right)\left(4c^8-18a^4b^3\right)$

$\left(3x^2-5y^{10}\right)\left(5y^{10}+3x^2\right)$

$x+5<x+2$

$\left(15-x\right)\left(5-x\right)$

$\tan^4\left(t\right)+\tan^2\left(t\right)=\sec^4\left(t\right)-\sec^2\left(t\right)$