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 .
[Trigonometry]
[Back]
[Next]
[Geometry]
[Algebra]
[Differential Equations]
[Calculus]
[Complex Variables]
[Matrix Algebra]
S.O.S MATHematics home page
Do you need more help? Please post your question on our
S.O.S. Mathematics CyberBoard.
Luis ValdezSanchez
Tue Dec 3 16:28:04 MST 1996
Copyright © 19992019 MathMedics, LLC. All rights reserved.
Contact us
Math Medics, LLC.  P.O. Box 12395  El Paso TX 79913  USA
users online during the last hour