$\frac{d^2}{dx^2}\left(x^3-3x\right)$
$-24.37+5.5$
$36x^2-6$
$\int\sqrt{a-bx}dx$
$sin^2x+4cos^2x$
$4x^2cosxsinx$
$\frac{x+2}{x}-\left(x+3\right)$
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