Using Euler's formulas, the cosine of x can be expressed as (e^(ix) + e^(-ix)) divided by what number?
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2
By adding the expressions for e^(ix) and e^(-ix), the imaginary sine terms cancel out, leaving 2 cos(x). Dividing by 2 yields the exponential definition of the cosine function.
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- According to Euler's formulas, the expression (e^(ix) + e^(-ix)) / n is equal to cos(x) when n is what value?