$\int\left(3x^{3}+2x+1\right)dx$
$3\sec^2x=4$
$a\left(x+4\right)+b\left(x+4\right)+c\left(x+4\right)$
$\frac{1}{\cos\left(x\right)^2\sin\left(x\right)}$
$\int2^{-y}\:dy$
$\frac{d}{dz}\frac{\sqrt{z}}{2^z}$
$\frac{6x^2-7x-5}{2x+6}$
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