Problem

Obtain expression (5-23) from equation (5-22), Using cos θ = cos2(½θ) - sin2(½θ) and sin θ...

Obtain expression (5-23) from equation (5-22), Using cos θ = cos2(½θ) - sin2(½θ) and sin θ = 2 sin(½θ) cos(½θ), first convert the argument of the cotangent from kL to½kL. Next, put the resulting equation in quadratic form, and then factor. Note that a is positive by definition.

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