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f'(60) = 1/2.(-1)-1/3.0.1/2v3
=-1/2
2. y' = 4cos 4x -5sin 5x+18 x^2
3. f' = 5.3 sin ^2(3x^4+5). 12x^3 . cos x
= 15 .12x^3 cos x sin ^2 (3x^4,+5)