Prove that (x, t) = A cos (kx - t - /2) is equivalent to (x, t)

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Prove that
ψ(x, t) = A cos (kx - ωt - π/2)
is equivalent to
ψ(x, t) = A sin (kx - ωt)

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Optics

ISBN: 978-0133977226

5th edition

Authors: Eugene Hecht

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