$4x+16>0$
$sc\theta\:\left(1-cos^2\theta\:\right)=sen\theta\:$
$\log_{81}\left(3-x\right)=\log_{81}\left(5x-15\right)$
$\left(-3\right)-\left(+9\right)-\left(-2\right)-\left(-5\right)$
$\int_{\infty}^0\left(e^{-x}\right)dx$
$3.77\cdot1.25$
$45-5x^2$
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