Verify that sin = (ei - e-i) / 2i, cos = (ei + e-i) / 2

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Verify that sinθ = (eiθ - e-iθ) / 2i, cos θ = (eiθ + e-iθ) / 2
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Quantum Chemistry

ISBN: 978-0321803450

7th edition

Authors: Ira N. Levine

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