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(3) Φ(x) = x∫<0, x>√(1+t)dt , Φ'(x) = ∫<0, x>√(1+t)dt + x√(1+x)
(4) F(x) = x∫<0, x>cos(t^3)dt, F'(x) = ∫<0, x>cos(t^3)dt + xcos(x^3),
F''(x) = cos(x^3) + cos(x^3) - xsin(x^3)(3x^2)
= 2cos(x^3) - 3x^3sin(x^3)
(4) F(x) = x∫<0, x>cos(t^3)dt, F'(x) = ∫<0, x>cos(t^3)dt + xcos(x^3),
F''(x) = cos(x^3) + cos(x^3) - xsin(x^3)(3x^2)
= 2cos(x^3) - 3x^3sin(x^3)
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