$a^6-9$
$2\left(2-3\right)+3\left(3-5\right)$
$\:\int\frac{sin\left(x\right)}{x}dx$
$5x^2+5x^2+4y+8+9x^2+12y$
$\int_2^{10}\left(28x+2\right)dx$
$6x^2-21x+49$
$4-sin^2x\:$
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