cos 45 derajat x cos 15 derajat=
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Pertanyaan
cos 45 derajat x cos 15 derajat=
1 Jawaban
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1. Jawaban SadonoSukirno
cos 45 × cos 15
= ½{cos (45-15) + cos (45+15)}
= ½{cos 30 + cos 60}
= ½{√3/2 + 1/2}
= ¼(√3 + 1}