$2x^2-7^2$
$-10\left(6a-9\right)+8$
$cot\:t\:csc\:t\:\:=\:\frac{csc^2t-1}{cos\:t}$
$-3x\:-\:4\:=\:2$
$3x-9x+1$
$\left(\frac{n-1}{n\cdot\:\:5^n}\right)\left(2x-1\right)^n$
$\sqrt{\frac{14x^3y^2}{2x^5y}}$
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