$\left(-2\right)+5\left(-7\right)\cdot\left(8-6-1\right)$
$1-3+4-3-1+2$
$2x^2-11=87$
$\frac{1}{csc^2x-1}$
$cos^2x-sin^2x=1$
$\frac{1}{73}+\pi$
$\frac{3}{x}-\frac{4}{x+2}$
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