$\log\left(x+1\right)+\log\left(x+3\right)=2\log\left(x\right)$
$\int\sqrt[2]{3-x^2}dx$
$1-cos\left(a\right)^2=sen\:2a$
$x^218x+81$
$\csc^2\:x-1$
$3a^2+a^2+b$
$\int236t\:dz$
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