Question: The sinusoidal current i = 2 0 * * 1 0 - 3 s i n ( 5 0 , 0 0 0 t -

The sinusoidal current i=20**10-3sin(50,000t-40) is plotted in the figure below. Determine the time t1 when the waveform crosses the axis.
The sinusoidal current i = 2 0 * * 1 0 - 3 s i n

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