$x^4-16y^2$
$\left(4x^3-x^2-3x+1\right)x\left(x-3\right)$
$5x-6y^5-14y^5-13x$
$\frac{25+36x^4}{5-6x^2}$
$1-ctgx=\sqrt{csc^2x-2ctgx}$
$8a^2b-5b^2a-2+2ba^2-1$
$60\cdot62$
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