$=x^3+2-x^3+6$
$\frac{x^3-6x^2+12x-8}{x-2}$
$\ln\frac{x^3+3}{x^4}$
$\frac{d}{dx}\tan\sqrt{a^2-x^2}$
$x-5+3x-4$
$4tan\left(x\right)sin\left(x\right)+3sec\left(x\right)$
$\:\frac{\left(sin\left(3x\right)+sin\left(x\right)\right)}{cos\left(3x\right)+cos\left(x\right)}$
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