$\:\:\frac{5^3}{5^1}$
$-cos4\frac{\pi}{2}$
$6x^2+11x+4=0$
$169x^{16}-144y^4$
$16-2x,\:\sqrt{x-3}$
$\int in4ydy$
$18a^3b^2\:\:\:12a^5b^3\:\:\:48a^2b^4$
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