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I know how to find multiple zeros by repeating find_root over an interval. But how do I find multiple inflection points? Sin has an infinite number but like find_root I'd like to just find them over various intervals.

I know how to find multiple zeros by repeating find_root over an interval. But how do I find multiple inflection points? Sin has an infinite number but like find_root I'd like to just find them over various intervals. However solve(diff(f)==0,x) doesn't have an option for choosing an interval.