the exact value of each trigonometric function  9. tan -30 degrees  15. tan 90 degrees  17. Sin 990

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section: Chapter Questions
Problem 28RE
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find the exact value of each trigonometric function 

9. tan -30 degrees 

15. tan 90 degrees 

17. Sin 990 degrees 

19. Cos 780 degrees 

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