$\int\frac{\sqrt{1+x^2}}{-2x}dx$
$\frac{3x^2-\left(7x+1\right)\sqrt{x}+5}{x-1}$
$\int5xsqrt\left(x-1\right)dx$
$4p+5p-7p$
$\left(-a^2-3b\right)^2$
$64d^2-16a+1$
$12 \cdot 3 + 18 : ( - 2 + 8 )$
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