jika cos 20° = m, maka sin 260 =…
Matematika
jessica325
Pertanyaan
jika cos 20° = m, maka sin 260 =…
1 Jawaban
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1. Jawaban abyandaffa11
sin 260° = sin (240 + 20)
= sin 240 cos 20 + cos 240 sin 20
sin 20 = akar (1 - m^2)
= (-akar 3 / 2) × m + 1/2 × akar (1 - m^2)
= -m akar 3 / 2 + 1/2 akar (1 - m^2)