$2\cot\left(x\right)=\csc^2\left(x\right)$
$\left(\frac{35\cdot a^9\cdot b^3}{21\cdot a^7\cdot b^5}\right)^{-4}$
$\frac{8m^327n^6}{2m+3n^2}$
$-4x\left(7-3x\right)=0$
$1.8\cdot9.81$
$\frac{4x^2+12x+12}{2x+3}$
$x+86=47$
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