$\int\left(tan^2\:y+1\right)dy$
$2x^2+4x-16$
$2,50+2,50+15,00$
$\int\left(\left(2x\right)\left(x^2-6\right)^4\right)dx$
$2b^2+b^2+b^2+b+b^3+b+b$
$\log_{27}\left(x\right)+\log_{27}\left(x-21\right)=\log_{27}\left(100\right)$
$\log\left(3x-2\right)=1$
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