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The displacement of a standing wave on a string is given by D=3.6sin(0.67x)cos(36t), where x and...

The displacement of a standing wave on a string is given by D=3.6sin(0.67x)cos(36t), where x and D are in centimeters and t is in seconds.

Find the speed of a particle of the string at x=2.50cm when t=2.9s.

∂D/∂t(2.50cm,2.9s) = ?

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