2 cos 120° + sin 330°- cos 240° adalah?
Matematika
Gavrillaaa21
Pertanyaan
2 cos 120° + sin 330°- cos 240° adalah?
1 Jawaban
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1. Jawaban ahmad1904
[tex]2cos120 + sin330 - cos240 \\ = 2( - cos60) + ( - sin30) - ( - cos60) \\ = 2( - \frac{1 }{2} ) - \frac{1}{2} + \frac{1}{2} \\ = - 1 - 0 \\ = - 1[/tex]