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[" If the substitution "z=ln(tan(x)/(2))...

[" If the substitution "z=ln(tan(x)/(2))" changes the differential equation "],[(d^(2)y_(y))/(dx^(2))(cot x)(del y)/(dx)+4y cosec^(2)x=0" to "(sigma^(2)y)/(dz^(2))=ky," then "|k|" is equal to "]

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