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$$ N_v = 0.5(t^{2}+2t^{6/7})\ln(1+2t^{-8/7})-t^{6/7} \tag{1} $$ $$ N_v =(0.871+0.125\ln t)^2 \tag{2}$$ Eq(2) is the approximated version of Eq(1). Does anyone know how to derive (2) from (1)? I'd appreciate your intuiton.

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    For what range of $t$ is this approximation supposed to hold?2011-11-16
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    Are you sure these equations are well given?, because if my calculations are correct the 1st one doesn't verify the 2nd.2011-11-16
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    i think range of t is 0.0012011-11-17

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