$3x^2-4xy+y^2-5xy+6x^2-3y^26y^2-8xy-9x^2$
$\frac{64x^6+343}{4x^2+7}$
$y'=e^{-2x}+2x$
$-2q^2+28q=94$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{8\cdot x-4\pi}{cos\left(2\pi\right)}\right)$
$x^3-x^2-9x-6$
$-\left(\frac{8}{9}\right)^0$
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