$b^4+625b^2+168^2$
$4.64^2$
$\ln\left(\frac{13}{x}\right)$
$\frac{x-1}{x^3+x^2}$
$\frac{d}{dx}y^4$
$\sin\left(x\right)\left(-\sin\left(x\right)\right)-\left(\cos\left(x\right)\left(\cos\left(x\right)\right)\right)$
$\frac{x^4-4x^2+16}{x-4}$
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