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y = cos⁵(4x-2)
misal : u = 4x - 2
du/dx = 4
soal menjadi : y = cos⁵u
dy / du = - 5 sin u .cos^4 u
f'(x) = dy/dx
= du/dx . dy/du
= 4 (- 5 sin u .cos^4 u)
= - 20 sin (4x - 2) cos^4 (4x - 2)