Step-by-step Answer
PAGE: 407SET: ExercisesPROBLEM: 91
Please look in your text book for this problem Statement


Show that .

The voltage is .

Where, the frequency is .

The power is

Where is resistance and is the time in seconds.

Substitute in .

Therefore, .


Observe the graph :

The graph of the function does not passing through the origin and shifted units downward.

hence,the graph of the function is a cosine function.

The geneal form of cosine function is .

Where, is amplitude and and is the phase shift.

Compare the equation with graph of the function.

Amplitude is and Period is .


Substitute all the values.



Deduce that .

Equate the two power functions.

Cancel the common terms.


(a) .

(b) .

(c) .


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