TRIGONOMETRIC FUNCTIONS  EXERCISE 2
 (a)

Evaluate (give an exact answer).
 (b)

If and , find
(give an exact answer).
Solution:
(a) Observe that
5 whole revolutions . Since has period ,
it follows that
. The angle
lies in the third quadrant and has as reference angle,
therefore is a point on the angle and on the unit
circle, from which we obtain:
(b) Observe that
, from
which we obtain that .
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Luis ValdezSanchez
Tue Dec 3 16:28:04 MST 1996
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