Question

Answer the question plz fastly with explanation​

Answer 1

1) cos(A + B) is the answer.

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Answer 2

Answer:

2) cos(a-b)

Step-by-step explanation:

As you can see in the table above, cos45∘ or cosπ 4 radians is the same thing as √2 2 An alternative way is looking at the unit circle: We know that the cosine of an angle is the x -value of a coordinate. At π 4, we can see that the x -value is √2 2.