October 2018 1 65 Report
Kalau mau nyari nilai cot 120 derajat
pakai cara yang mana
cot 120 derajat=cot(90derajat + 30derajat) = -tan 30derajat= -1/3√3
atau
cot120 derajat =cot(180 derajat - 60 derajat)= -cot 60 derajat = -1/3√3
???
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