$\frac{1}{\left(sen\theta\:\cdot\:\:cos\theta\:\right)}-cot\theta\:$
$\left(t+2\right)^2$
$a^2+2\cdot abt+b^2\cdot t^2$
$12^2:\:\left(-2\right)^2$
$\frac{dy}{dx}=\frac{15x}{11+x^2}$
$\frac{6}{\infty}$
$4x^2-12x+8>0$
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