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The voltage of an ac source varies with ...

The voltage of an ac source varies with time according to the equation V = 100 sin(100 `pi`t)cos(100`pi`t) where t is in second and V is in volts. then
a) the peak voltage of the source is 100 V
b) the peak voltage of the source is `100 `/`(sqrt2)`
c) the peak voltage of the source is 25 V.
d) The frequency of the source is 100 `H_Z`

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