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  • Assume f is a differentiable function whose graph passes through the point (1,4).If g(x) = f(x^2) and the tangent line t

    Assume f is a differentiable function whose graph passes through the point (1,4).If g(x) = f(x^2) and the tangent line to the graph of f at (1,4) is y=3x+1,determine g'(x)?
    數(shù)學(xué)人氣:422 ℃時(shí)間:2020-09-02 22:52:15
    優(yōu)質(zhì)解答
    依題目所示,f(x)過點(diǎn)(1,4)且在點(diǎn)(1,4)處的切線為y=3x+1,
    因此有f'(x)=3x+1,兩邊進(jìn)行積分得到
    f(x)=1.5x^2+x+C
    由于f(x)過點(diǎn)(1,4),將x=1,y=4代入上式,得C=1.5
    故f(x)=1.5x^2+x+1.5
    g(x)=f(x^2)=1.5(x^2)^2+x^2+1.5=1.5x^4+x^2+1.5
    g'(x)=6x^3+2x
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