$\frac{1+cot^2\left(x\right)}{2cot\left(x\right)}=csc\left(2x\right)$
$4xy\frac{dx}{dy}=x+1$
$\int_0^{senx}xdy$
$\int\frac{-x^2+4x}{-4}-\left(-x^2+4x\right)dx$
$-4=48$
$7-\left(-4-6-9+6\right)$
$\left|\left(3x\right)^4\right|^5$
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