$\left(-1\right)^{n+1}\cdot\frac{1}{3^n-1}$
$2\log\left(x-1\right)=0$
$\left|1+\left(-83\right)\right|-37$
$1=a\cdot\log_b\left(x\right)+c$
$\frac { \frac { 1 } { x } } { \frac { 1 } { x } }$
$\frac{\cosh\left(x\right)+1}{\cosh^2\left(x\right)-1}$
$v^2+12v+28$
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