$\frac{cot\left(x\right)}{csc\left(x\right)\cdot\left[1\:-\:sen^2\:\left(x\right)\right]}$
$\frac{d}{dx}lnx^{ln9x}$
$x^2+3x-5=y$
$\int_1^{\infty}\:\frac{7n}{8n-7}dx$
$615+x^2=2^y$
$2\cdot9\cdot1$
$7m+8m+9m$
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