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Published online by Cambridge University Press: 03 November 2016
A Well-Known method of integrating the simple differential equation of the second order
y″ + k 2 y = 0 .....1.1
consists in multiplying by an integrating factor 2y′ and integrating directly, when we obtain
y′2 + k 2 y 2 = k 2 a 2, .....1.2
where a is an arbitrary constant.