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^ = pangakat15) R = √sin x
R = (sin x) ^½
R' = ½ (sin x) ^-½ . cos x
R' = (cos x) / (2 √sin x)
16) cos³ (5 - 4x)
= 3 cos² (5 - 4x). -sin (5 - 4x) . -4
= 12 cos² (5 - 4x) sin (5 - 4x)