A) \[-\pi <\phi <-\frac{\pi }{2}\]
B) \[\pi <\phi <\frac{3\pi }{2}\]
C) \[-\frac{3\pi }{2}<\phi <-\pi \]
D) \[\frac{\pi }{2}<\phi <\pi \]
Correct Answer: A
Solution :
[a] For \[x=(-A),\] we have \[-A=A\sin \,(\omega \times 0+{{\phi }_{0}})\,or\,{{\phi }_{0}}=-\frac{\pi }{2}\]. So for\[x<(-A),\,{{\phi }_{0}}<(-\pi /2)\].
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