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-The Output Voltage for An \mathrm AC\mathrm { AC }

question 173

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-The output voltage for an AC\mathrm { AC } generator is approximated by v=156cos(120πtπ3) \mathrm { v } = 156 \cos \left( 120 \pi \mathrm { t } - \frac { \pi } { 3 } \right) . Find the smallest positive value of t\mathrm { t } for which the output is 75 volts. Round values to 4 decimal places.


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