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Electromotive Force In an electric circuit, suppose that the electromotive force in volts at $$t$$ seconds can be modeled by $$V = \cos 2 \pi t$$Find the least value of $$t$$ where $$0 \leq t \leq \frac { 1 } { 2 }$$ for each value of $$V$$ . (a) $$V = 1$$ (b) $$V = 0.87$$ (c) $$V = 0.31$$