$-2.7+\left(-4.9\right)$
$\left(\left(z+c\right)-a\right)\left(\left(z+c\right)+a\right)$
$\int\frac{e^{-x}}{e^{-x}-1}dx$
$-\log x=2$
$\frac{m^5}{m^3}$
$\csc\left(x\right)\cot^2x+\csc\left(x\right)$
$8y+21\ge2y-54$
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