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misal a = 2x
da/dx = 2
b = sina
db/da = cosa
y = b³
dy/db = 3b²
f'(x) = dy/db * db/da * da/dx
= 3b² * cosa * 2
= 6b² * cosa
= 6(sina)².cosa
= 6.sin²a.cosa
= 6.sin²(2x).cos(2x)