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3 years ago

__cos b = 1/2 [cos (a+b) + cos (a-b)] A. sin(a) B. sin(b) C. cos(a) D. cos(b)

Mathematics

2 answers:

Annette [7]3 years ago

5 0

Answer:

C is correct

COS (A) is right

Step-by-step explanation:

Helen [10]3 years ago

4 0

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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