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Suppose that a mass suspended on a string has the following equation of motion x(t)  = ...

Suppose that a mass suspended on a string has the following equation of motion

x(t)  =  48 cos(4t) + 30 sin(4t)
(a) What is the absolute value of the maximum displacement x(t) and what is the period of motion? Separate your answers with a comma. The order doesn't matter.
(b) What is the velocity at t  = 
pi/2 ?
Math   Calculus   
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