E-fold count for the natural-inflation cosine potential

For the cosine potential,

N = \frac{2 f ^{2}}{M _{Pl}^{2}} [lo g sin \frac{ϕ _{i}}{2 f} - lo g sin \frac{ϕ _{f}}{2 f}] .

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Past exam of the mathematics course of the University of Cambridge / 2025 / ii / Paper 4 / 9E / c / Solution

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