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  • 1 # 使用者9347868027543

    (Xⁿ)" = n×Xⁿ﹣¹ ;如:(3X⁴)′= 4×3X³=12X³, (X)"=1×X¹﹣¹=1

    (求導時係數不變)

    (lnX)"= 1/X;(lgX)"=[(lnX)/(ln10)]"=(lnX)"/ln10=1/(Xln10)

    [af(x)]" = a[f(x)"] ;(其中a為係數)

    [f(x)±g(x)]" = f(x)"±g(x)";如:2X + lnX = 2+1/X

    [f(x)g(x)]"=f(x)×g(x)"+f(x)"×g(x) ;如:X³ × lnX = X³/X + 3X²×lnX = X²+3X²lnX

    [f(x)/g(x)]"=[f(x)"×g(x)-f(x)×g(x)"]/g²(x);如:(lnX)/X = [(1/X)X - lnX] / X²

    [f(g(x))]"=f"(g(x))×g"(x);如:ln(X³) = (1/X³)×(3X²)

    (sinX)"=cosX;如:(sin2X)"=(cos2X)×2

    (cosX)"= ﹣sinX

    (tanX)"=(sinX/cosX)"=[cos²X+sin²X]/cos²X=1/cos²X

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