$\left(3x+7\right)^4\cdot\left(4x\right)$
$\left(2d-1\right)\left(2d+3\right)$
$\lim_{x\to0}\left(\frac{tan\left(5x\right)-5tan\left(x\right)}{sin\left(5x\right)-5sin\left(x\right)}\right)$
$\sqrt{-25}+\sqrt{-81}$
$7y+6-1+12y$
$y'+3y=3,\:y\left(0\right)=3$
$\int\frac{x+3}{-3x^3-x^2+2x}\:dx$
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