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Question 10, Exercise 9.1

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is 56 Hz ( 56 cycles per second). The voltage can be modeled by $ V(t)=a \operatorname{Sin}(k(t-d))+c$

Question 1,Review Exercise

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n and its period is $\pi$, then $f(\theta)$ could be equal to:\\ * (a) $2\cos x$ \\ * (b) $2 \cos 3x$