Cos ( x + 60) - sin ( 30 - x) = ?
Matematika
Bela898
Pertanyaan
Cos ( x + 60) - sin ( 30 - x) = ?
1 Jawaban
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1. Jawaban bapakdr
cos (x + 60) - sin (30 - x)
= cos (x + 60) - sin (90 - (30 - x))
= cos (x + 60) - cos (90 - 30 + x)
= cos (x + 60) - cos (x + 60)
= 0