Nilai cos 15°-cos 75°=
Matematika
tnindya
Pertanyaan
Nilai cos 15°-cos 75°=
1 Jawaban
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1. Jawaban dhiasputri
cos 15°- cos 75°
=(cos(45-30))-(cos(45+30))
=(cos45°.cos30°+sin45°.sin30°)-(cos45°.cos30°-sin45°.sin30°)
=(√2/2.√3/2+√2/2.1/2)-(√2/2.√3/2-√2/2.1/2)
=(√6/4+√2/4)-(√6/4-√2/4)
=√2/4+√2+4
=√2/2