$x^2-\left(2y+1\right)^2$
$\{ ( 4 - 6 ) + 2 ( 2 \cdot - 3 + 5 ) - 2 \}$
$\int\frac{sin\:5x}{1-cos\:5x}dx$
$\lim_{x\to9}\left(\frac{x^3-729}{3-\sqrt{x}}\right)$
$0.3\cdot100$
$32.587\:+\:369.877\:+\:1.011\:$
$-1\left(x-2\right)^2+4$
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