6.4.3 sum and difference formulas

Establish Identities
Find Exact value of Expressions

Establish the identity
 2cos sin
   
2 2cos cos sin sin 
  
   0 cos 1 sin  
sin sin   

Establish the identity
 sin sin   
sin cos cos sin    
   0 cos 1 sin   
sin sin 

Find the exact value of the
expression  1 13 12
5 5sin sin tan 

1 3
5sin  
 1 12
5tan 



3
5
4
12
5
13
 sin   sin cos cos sin    
     3 5 4 12
5 13 5 13  
15 48
65 65   33
65

Find the exact value of the
expression  1 1 54
5 12cos sin tan  

1 4
5sin 

1 5
12tan  


45
3

5
12
13
 cos   cos cos sin sin    
     3 512 4
5 13 5 13  
36 20
65 65  16
65

p. 482
# 39, 42, 45, 50, 51, 53, 62, 65 - 72

6.4.3 sum and difference formulas

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6.4.3 sum and difference formulas