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Verified answer
Bab TrigonometriMatematika SMA Kelas X
(sin 6a + sin 2a) / (sin² a - cos² a)
= (2 sin ((6a + 2a)/2) . cos ((6a - 2a)/2) / (- (cos² a - sin² a))
= (2 sin 4a . cos 2a) / (- cos 2a)
= - 2 sin 4a