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10 December, 08:35

Analysis of the voltage in certain types of circuits involves terms of the form sin (nw^0t-90 degrees) where n is a positive integer, w0 is the frequency of the voltage, and t is time. Use an identity to simplify this expression.

A. cscnw0t

B.-cscnw0t

C. cosnw0t

D.-cosnw0t

+2
Answers (1)
  1. 10 December, 10:42
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    D. - cos (nw0t)

    Step-by-step explanation:

    Subtracting 90° from the argument of the sine function shifts its graph 90° to the right, putting the negative peak on the y-axis. That corresponds to the negative cosine function, choice D.
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