$\frac{21a^2b}{7a^2b}+\left(\frac{a^2}{b^2}\right)^0$
$3x\:x\:e^{-x}$
$1=\left(1-cos^2x\right)\left(1+cot^2x\right)$
$\left(0.3m-0.2n^2\right)^2$
$y ^ { 2 } + 12 y + 36$
$\frac{1+csc\left(x\right)}{cos\left(x\right)-cot\left(x\right)}$
$\int_0^44x\:dx$
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