$\lim_{x\to0}\left(\frac{8^x-2^x}{4^x}\right)$
$7\left(c-2d\right)-\left(5c+d\right)$
$\sqrt{5}\cdot\sqrt{x+5}$
$\sin\left(4x\right)+\sin\left(2x\right)$
$\int\left(x^2-4\right)e^{\left(-4x\right)}dx$
$\frac{4^n+1}{5^{n+1}}$
$\lim_{x\to0}\left(\frac{2x\left(cos2x\right)-1}{sin\left(4x\right)-4x}\right)$
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