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sin x cos x / cot x
sin x cos x / (1/tan x)
(sin x cos x) x tan x
(sin x cos x) x (sin x/cos x)
= sin^2 x
(sin x . cos x) / (cos x / sin x) = sin² x
(sin x . cos x) x (sin x / cos x) = sin² x
sin²x = sin² x ⇒ Terbukti