August 2018 1 81 Report
Lim x -> 0 (1-cosx) / (tan^2 2x) = (1-(1-2sin^2 (1/2x))) / (tan^2 2x) = (2 sin^2 (1/2 x)) / (tan^2 2x)
bisa jelasin ga itu asalnya dari mana?

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