6.4 Sum and Difference Formulas

Establish IdentitiesFind 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

Establish the identity 2 2sin sin sin sin

sin cos cos sin sin cos cos sin

2 2 2 2sin cos cos sin

2 2 2 2sin 1 sin 1 sin sin

2 2 2 2 2 2sin sin sin sin sin sin

2 2 2 2sin sin sin sin

Find the exact value of the expression 1 13 125 5sin sin tan

1 35sin 1 12

5tan

35

4

12

5

13

sin sin cos cos sin

3 5 4 125 13 5 13 15 4865 65 33

65

Find the exact value of the expression 1 1 545 12cos sin tan

1 45sin

1 512tan

45

3

5

12

13

cos cos cos sin sin

3 512 45 13 5 13 36 2065 65 16

65

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