1 cos 75 derajat dikali cos 15°
Matematika
eldama26
Pertanyaan
1 cos 75 derajat dikali cos 15°
1 Jawaban
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1. Jawaban Jkira
cos 75 cos 15
= 1/2[cos(75+15) + cos(75-15)]
= 1/2[cos 90 + cos 60]
= 1/2[0 + 1/2]
= 1/4
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