Berapa hasil dari : Sin²(780°) = ...
Matematika
Salwaamalinaput
Pertanyaan
Berapa hasil dari :
Sin²(780°) = ...
Sin²(780°) = ...
1 Jawaban
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1. Jawaban keruasriki
=> 1/2 ( 1 - cos2×780 )
=> 1/2 (1 - cos(2.720 + 2.60)
=> 1/2 (1 - cos(2.60))
=> 1/2 ( 1 - cos(90+30))
=> 1/2 ( 1 - (-sin30))
=> 1/2 (1 - (-1/2))
=> 1/2 (1 + 1/2)
=> 1/2 (3/2)
=> 3/4