  PRE-ALGEBRA
ALGEBRA 1
GEOMETRY
ALGEBRA 2
TRIGONOMETRY
PRE-CALCULUS
CALCULUS    Pre-Calculus, 9th edition PAGE: 407 SET: Exercises PROBLEM: 91
Please look in your text book for this problem Statement  (a).

Show that .

The voltage is .

Where, the frequency is .

The power is Where is resistance and is the time in seconds.

Substitute in .  Therefore, . (b)

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.  . (c)

Deduce that .  Equate the two power functions. Cancel the common terms. . (a) .

(b) .

(c) . TESTIMONIALS
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