$-x^2+2-1+6x^2-4x^2$
$\frac{dy}{dx}=3x^2-12x^{-7}$
$\int\frac{1}{cos^3x}dx$
$\left(7x+5+4y\right)\left(7x+5-4y\right)$
$6,95\cdot48,9$
$-7\cdot3+6$
$x^2y'=xy$
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