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In this work we construct uniform asymptotic expansion of $\sn(t|m)$ - Jacobiwhen $m\to1-0$. The constructed expansion is valid over more than a half ofperiod. The turning point is included into the interval of validity for theapproximation. In addition we obtain the asymptotic formula for ellipticintegral of the first kind and discuss the differences with the same formulafrom a handbook.

Uniform asymptotic behaviour of Jacobi-$\sn$ near a singular point. The Lost formula from handbooks for elliptic functions