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-1200 derajat = -120 derajat + 3 x -360 derajat
-120 derajat (searah jarum jam) = 240 derajat (berlawanan arah jarum jam)
tan (-1200 derajat)
= tan (-120 derajat)
= tan (240 derajat)
= tan (180+60) derajat
= tan 60 derajat
= v3 (akar 3 karena dikuadran 3)