$-x^2y^2+\left(-5xy^3\right)+\left(-4y^4\right)+7xy^3-8+x^2y^2$
$\sqrt{16x^6}$
$x^{-2}-4<0$
$4^3+2^4+9^8$
$\left(3x+4y\right)\left(4x-6y\right)$
$\left(-7-\left(-10\right)\right)\cdot8$
$\left(\cos^2-1\right)\left(\tan^2+1\right)=1.\sec^2$
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