For the following signals,determine whether it is periodic,and if it is,find
the fundamental period:
3
x(t)=sin (2t)
Ans:Periodic,with a fundamental period of (1/π)s
請問大大們這題要怎麼算，已經試過兩倍角公式和三倍角了，還是弄不出來= ="
明天要考，拜託各位啦orz
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