$\frac{27x^5}{42x}$
$2m^2+4mn+2n^2$
$\int\frac{\sin\left(7x\right)}{\cos\left(7x\right)-1}dx$
$x^2\left(-\frac{1}{e^x}\right)$
$\sqrt{x^2-49}=7cot\theta\:$
$\int17x^3\sqrt{1+x^2}dx$
$-3xy^221xy^3and15xy^4$
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