$\int\frac{x^2+8}{x-7}dx$
$\left(csc^2x-1\right)sinx=cot^2xsinx$
$\frac{2a^3}{2b^2}b^3$
$a^{12}-b^{12}$
$7+9f-4$
$2csc^2x-3cscx+1$
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