The sum of the coefficients in the binomial expansion of \( \left( \frac{1}{x} + 2x \right)^6 \) is equal to:
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This shortcut works because the expansion is $c_0(x^a) + c_1(x^b) + \dots$. When $x=1$, every term becomes just the coefficient $c_i$, leaving you with their total sum.