(2:3) The Wave Equation: Derivation (Walter Lewin, MIT)
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Math topics:
Differential equationsDifferential equationOrdinary differential equationPartial derivativeElementary special functionsSmall-angle approximationSquare (algebra)SineTrigonometric functionsElementary arithmeticPlus-minus signPlus and minus signsApproximationMathematical analysisTangentFunction (mathematics)Infinitesimal
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