求下列函数的导数: (1)y=f[(x3+33x)〞]; (2)y=[f(3x3×cosx)]n

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问题 求下列函数的导数:
(1)y=f[(x3+33x)〞];  (2)y=[f(3x3×cosx)]n

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答案解:注意复合函数的构造层次. (1)yˊ=fˊ[(x3+33x)n]×n(x3+33x)n-1×(3x2+33xln3×3) =3n(x2+33xln3)(x3+33x)n-1×fˊ[(x3+33x)n]. (2)yˊ=n[f(3x3×cosx)]n-1×fˊ(3x3×cosx)×(3x3×ln3×3x2×cosx-3x3sinx) =n(31n3×x23x3cosx-3x3sinx)×fˊ(3x3×cosx)×[f(3x3×cosx)]n-1

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