$\frac{2}{w}-\frac{2+w}{3w}$
$\frac{dx}{dx}=\frac{xy}{2}$
$-2b+2c$
$\lim_{x\to\frac{\pi}{2}}\left(sec^3x+tan^3x\right)$
$15x+2=47$
$7cos\left(x\right)-\sqrt{13}=0$
$-100+-9$
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