"Let "e^(y)=(sqrt(1+alpha)+sqrt(1-alpha)...

`"Let "e^(y)=(sqrt(1+alpha)+sqrt(1-alpha))/(sqrt(1+alpha)-sqrt(1-alpha)) and "tan"(x)/(2)=sqrt((1-alpha)/(1+alpha)),alpha in [-1, 0]cup(0,1]." Then "((dy)/(dx))_(x=(pi)/(3))=`

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