$x^2+6x+63$
$\lim_{x\to0}\left(\frac{sin\left(4x\right)-4x\left(cos\left(4x\right)\right)}{4x-sin\left(4x\right)}\right)$
$\frac{1}{5}b+\frac{2}{3}b$
$\frac{cot^2x}{cosxcsc^2}$
$5f+7f$
$y^3-z^3$
$\int\left(y^2\right)dy$
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