Angle x lies in the first quadrant such that: cosx=3           5   and angle y lies in the second quadrant such that siny= 7          25 Determine an exact value for cos (x−y).   *will need to use a compound angle formula

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter9: Real Numbers And Right Triangles
Section9.7: The Tangent Ration
Problem 27E
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Angle x lies in the first quadrant such that:

cosx=3
          5
 
and angle y lies in the second quadrant such that
siny= 7
         25
Determine an exact value for cos (x−y).
 
*will need to use a compound angle formula
 
Please write clearly thank you. 

                                                                                 

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