Cos 120*derajat =?, pliss krg paham sama giniaaann-__

October 2018 2 39 Report

Cos 120*derajat =?, pliss krg paham sama giniaaann-___-

5dregensleyer Kuatrat 2
cos 120° = - cos ( 180 - 60)
= - cos 60
= - 1/2

1 votes Thanks 2

izharulhaq78 $\cos120=\cos(90+30)\\\cos120=\cos90\cos30-\sin90\sin30\\\cos120=0-\sin30\\\cos120=-\sin30\\\cos120=-\frac{1}{2}$

1 votes Thanks 1

nindi15 cos 120 merupakan kuadran 2. cos nilainya negatif.

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