TRIGONOMETRI
2 sin x cos y = sin (x + y) + sin (x - y)
•••
2 sin 5a cos a
= sin (5a + a) + sin (5a - a)
= sin 6a + sin 4a
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TRIGONOMETRI
2 sin x cos y = sin (x + y) + sin (x - y)
•••
2 sin 5a cos a
= sin (5a + a) + sin (5a - a)
= sin 6a + sin 4a