$\int3xcos5dx$
$4y^2+36+81$
$\frac{1-sin^2\left(x\right)}{cot^2\left(x\right)}+cos^2\left(x\right)$
$6y^2-19+3$
$\frac{sen^3u}{tan\:u\:-senu}=cos\:u\:\left[1+cos\:u\right]$
$6n\left(5n+1\right)$
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