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Write amplitude of resultant wave produc...

Write amplitude of resultant wave produced by the superposition of two waves of the same frequency and amplitude `a_(1)` and `a_(2)` when phase difference between them `pi`.

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Amplitude of resultant wave is (`a_(1)-a_(2)`) if `a_(1) gt a_(2)` or (`a_(2)-a_(1)`) if `a_(2) gt a_(1)`.
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