$\frac{1}{csc^2s-1}$
$-4x\:+\:12\:=\:2x\:+\:18$
$3x+\left(x-2\right)\left(x+1\right)$
$\frac{81x^2-16}{9+4}$
$1000x-x$
$7a\:+\:y+z^3-21yz^3-9a+y+24a+y+z^3-6a+y+4y+z^3$
$f\left(x\right)=\frac{1}{16+4x}$
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