$4a^2-18a+9$
$-4r-2r+5$
$\left(\frac{csc\left(x\right)+sen\left(x\right)}{cos\left(x\right)}+tan\left(x\right)\right)\cdot\:\sqrt{6}$
$\int_0^{30}\left(\frac{\cos\left(x\right)}{1+4\sin^2\left(x\right)}\right)dx$
$\cos\left(6\right)+\sin\left(6\right)=\tan\left(6\right)$
$x+3y=25$
$\left(5a-3b+c\right)-\left(-3c+8b\right)$
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