$$f(x)=11,2x^{-6,46x^3}\\ x=0,29\\ u=11,2x\\ u'=11,2\\ v=e^{-6,46x^3}\\ v'=-19,38e^{-6,96x^3}\cdot x^2\\f'(x)=11,2\cdot e^{-6,46x^3}+(-11,2x\cdot 19,38e^{-6,46x^3}\cdot x^2)\\ 11,2\cdot e^{-6,46x^3}[1-19,38x^3]\\ f(0,29)\approx 2,7746\\ f'(0,29)\approx5,04⇒\\ E=f'(x)\cdot \frac{x}{f(x)}\\ E\approx 5,04\cdot \frac{0,29}{2,7746}\\ E\approx 0,527$$