$\frac{\left(49y^2\right)}{\left(7y^8\right)}$
$\frac{sin\left(x\right)}{1-cos\left(x\right)}-cot\left(x\right)$
$\int sin\left(3z\right)cos\left(8z\right)dz$
$\int e^{-16x}dx$
$\int2\cos\left(x^2\right)dx$
$\left(3m+9n\right)\left(3m-9n\right)$
$\frac{x^4-x+1}{x+2}$
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