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Input:
toexp(cos(x))
Write:
`toexp(cos(x))`
Compute:
$$convert \ to \ exp :\\ \ cos(x)$$
Output:
$$convert \ to \ exp :\\ \ cos(x)== \frac{1}{2}\ exp((-i)\ x)+\frac{1}{2}\ exp(i\ x)$$
Result: $$\frac{1}{2}\ exp((-i)\ x)+\frac{1}{2}\ exp(i\ x)$$
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