Given figure shows the circular motion of a particle. The radius of circle, the period sense of ...

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Given figure shows the circular motion of a particle. The radius of circle, the period sense of revolution and the initial position are indicated on the figure, the simple harmonic motion of the \( x \)-projection of the radius vector of the rotation particle p is :
(1) \( x(t)=B \sin \left(\frac{\pi}{15} t\right) \)
(2) \( x(t)=B \cos \left(\frac{\pi}{15} t\right) \)
(3) \( x(t)=B \sin \left(\frac{\pi t}{15}+\frac{\pi}{2}\right) \)
(4) \( x(t)=B \cos \left(\frac{\pi t}{15}+\frac{\pi}{2}\right) \)
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