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Verified answer
Jawaby = 2 sin (x² + 4)
u = x² + 4
du/dx = 2x
y = 2 sin u
dy/du = 2 cos u
y' = dy/dx
f'(x) = y' = dy/dx = dy/du. du/dx
f'(x) = 2 cos u. (2x)
f '(x) = 4x . cos (x² + 4)