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**Simple Question About Pendulum I Can't Do !!**

The motion of the bob of a pendulum is described by

theta = 3cos(3t) - sqrt3 sin(3t)

where theta is the angle of the bob from the vertical. What is the amplitude of this motion??

as an attempt, as i know what the answer is, but just dont know how to get to it i substituted the answer for theta and tried to find what t was

but it didnt help i dont really no where to start for this probelm

thanks if youcould help