__cos b = 1/2 [cos (a+b) + cos (a-b)]
A. sin(a)
B. sin(b)
C. cos(a)
D. cos(b)
2 answers:
Answer:
C is correct
COS (A) is right
Step-by-step explanation:
Answer:
cos(a)
Step-by-step explanation:
I substituted it on a calculator:
a = 30
b = 45
1/2 [ cos (a + b) + cos (a - b)]
1/2 [ cos (30 + 45) + cos (30 - 45)] = Sqrt6/4
cos(a)cos(b)
cos(30)cos(45) = Sqrt6/4
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