$\frac{1}{cscx+1}-\frac{1}{cscx-1}=-2\tan^2x$
$\left(x-1\right)\left(y-2\right)=\:0$
$-7ab+11ab-20ab+31ab$
$2x+8\le x+12$
$3x+4y=6$
$1\cdot3.1416$
$4x^4-25x^2$
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