$\int ln\left|x^2+1\right|dx$
$12mn-23mn-5mn$
$x^4-12x^2y^2+36y^4$
$\sqrt[6]{\left(x-1\right)\left(x+1\right)\left(x^2+1\right)\left(x^4+1\right)+1};\:x=3$
$\log2x+3=1$
$2x^4-6x^3+3x^2-4x-2\:entre\:x^2+x-3$
$\int\cot\left(d\right)$
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