Using the addition rule of the Sine function and the Cosine function, we obtain
.
<h3>What are the formulas for (sin x + sin y) and (cos x + cos y)?</h3>
- The formula for the addition of two Sine functions (
) is
. - The formula for the addition of two Cosine functions (
) is
.
Given that

Then using the above formulas, we get:
(1)
(2)
Dividing the equation (1) by (2), we get:
(3)
Now, we know that
.
Thus, using the above formula, we get from (3):

Therefore, using the addition rule of the Sine function and the Cosine function, we obtain
.
To know more about Sine and Cosine functions, refer: brainly.com/question/27728553
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Answer:A
Step-by-step explanation:
Subtract 7 from 9. You get 2. It is the "extra". The answer, therefore is 1 2/7