Matematika 14. Nilai cos 210° + sin 60° =​

deontelednerulv – April 06, 2023

14. Nilai cos 210° + sin 60° =​

Jawaban:

cos 210 + sin 60 = cos (180 + 30) + sin 60

= cos 180 cos 30 - sin 180 sin 30 + sin 60

=(-1) (1/2 akar 3) - (0) (1/2) + (1/2 akar 3)

= 0

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