sin (30+α) + cos (60+α)
Matematika
Ayumrska
Pertanyaan
sin (30+α) + cos (60+α)
1 Jawaban
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1. Jawaban SadonoSukirno
= (sin 30 cos a + cos 30 sin a) + (cos 60 cos a - sin 60 sin a)
= ½.cos a + ½√3.sin a + ½.cos a - ½.√3.sin a
= ½.cos a + ½.cos a
= cos a