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Derivativeshard
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If f(x)=ln⁡(x2+y2)f(x) = \ln(x^2 + y^2)f(x)=ln(x2+y2) and y=e3xy = e^{3x}y=e3x, find f′(x)f'(x)f′(x) at x=0x=0x=0.