$\cot\left(v\right)-\tan\left(v\right)=2\cot\left(2v\right)$
$-x+2y=8$
$1x^2+1x+0,25$
$4n^2-16n+26=0$
$2xy\:+4xy$
$-2<\left|-1\right|$
$\int_0^{\infty\:}b\left(w\right)sen\left(wx\right)dw$
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