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x =7cos 0.5\pit  find the displement

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Max. displacement is the max value of X

X = 7 cos 0.5\pit

max \left | cos 0.5\pi t \right |   = 1 , when 0.5\pit = n\pi                  so, t = 0,2,4...

Amplitude = 7

wavelengh = 14 

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