Matematika Sekolah Menengah Pertama Q. gabut (5/5)gunakan relasi sudut!!cos 330° + 2 sin 240° - sin 210° =​

idellschneiderulv – March 07, 2023

Q. gabut (5/5)

gunakan relasi sudut!!
cos 330° + 2 sin 240° - sin 210° =


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[tex] \sin330 + 2 \ \sin(?) 240 - \sin210 \\ \sin(360 - 30) + 2 \ \sin(180 + 60) - \sin(180 + 30) \\ = - \sin30 + 2( - \sin30) - ( - \sin30) \\ = \frac{1}{2} + 2( - \frac{1}{2} ) + \frac{1}{2} \\ = - \frac{1}{2} + ( - 1) + \frac{1}{2} \\ = \frac{1 - 2 + 1}{2} \\ = \frac{ - 2}{ 2} \\ = - 1[/tex]

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