$4-4-3+2x^2-6x^2-5y^3$

$\int3\cdot secx$

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

$x^7\left(-7x\right)$

$\left|-\left(3m^2+3n^3\right)+\left(2g+b^3\right)\right|\left|\left(3m^2+n^3\right)+\left(2g+b^3\right)\right|$

$a^2b^2-3ab^2$

$-\left|3x^2+\left(-2x+5x^2\right)-9x\right|$