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mis
U=2x-3
U'=2
f(U)=U^4
f'(U)=4U^3 . U'
f'(x)=4(2x-3)^3 . 2
f'(x)=8(2x-3)^3
f'(3)=8(2(3)-3))^3
f'(3)=8(3)^3
f'(3)=8(27)
f'(3)=216