cos(x+y) + cos(x-y) / sin(x+y) + sin(x-y) = cot x
Matematika
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Pertanyaan
cos(x+y) + cos(x-y) / sin(x+y) + sin(x-y) = cot x
1 Jawaban
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1. Jawaban Anonyme
Misal :
A = cos (x + y) + cos (x - y)
A = 2 cos x cos y
B = sin (x + y) + sin (x - y)
B = 2 sin x cos y
...soal...
= A/B
= cos x / sin x
= cotan x
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