sin^ 35 ° + sin^ 55 ° =
Matematika
Stephen131
Pertanyaan
sin^ 35 ° + sin^ 55 ° =
1 Jawaban
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1. Jawaban susanto17
sin 35° + sin 55° = 2.sin[(35°+55°)/2].cos[(35°-55°)/2]
=2.sin45°.cos10°
=2(1/2√2)cos10°
=√2 cos 10°