$2x^2y-5xy^2+4x^2y+7xy^2-3xy-2xy^2$

$16g-19g=-3$

$\frac{sin\left(x\right)}{cos\left(x\right)}\left(\frac{cos\left(x\right)}{sin\left(x\right)}+\frac{sin\left(x\right)}{cos\left(x\right)}\right)$

$1-8t^5+16t^{10}$

$\left(3c+4m\right)^2$

$\left(4x^2-3y\right)^2$

$-3\le\frac{-3}{6}\le\frac{-1}{2}$