$dy.\frac{y}{\sqrt{1+y^2}}=3x.dx$
$-3x^2-2x+5+4x^2-7x+6$
$5c^2+30c+45$
$\left(-2x\right)\left(3x+4y\right)$
$\left(12a-7b\right)^2$
$3c^{\frac{2}{3}}=27$
$-75-\left(-75\right)$
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