latitude-longitude haversine great-circle

Which one is the best for small distance like 10 meters Haversine or Law of Cosines?

I am Using Haversine Formula to find the great circle distance in my work But I want to know The most Exact formula for small distance like 10 meters only

Solution

Continue using the haversine formula. The [spherical] law of cosines formula is known to be inaccurate at short distances. See https://en.wikipedia.org/wiki/Great-circle_distance ... also this SO question: MySQL WordPress Query Returning a Distance of Zero for Some Records

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