40. Express

4 cos š‘„ + 3 sin š‘„ in the
form Rsin(š‘„ + šœƒ)
A. 5Sin(x+36.9)
B. 5Sin(x+53.1)
C. 7Sin(x+36.9)
D. 7Sin(x+53.1)
X
Y

1 answer

To express 4 cos š‘„ + 3 sin š‘„ in the form Rsin(š‘„ + šœƒ), we first need to find the value of R and šœƒ.

Using the identity cos(š‘Ž - š‘) = cos š‘Ž cos š‘ + sin š‘Ž sin š‘, we can rewrite the expression as:

4 cos š‘„ + 3 sin š‘„ = 5 cos š‘„ cos 36.9Ā° + 5 sin š‘„ sin 36.9Ā°

We can see that this expression is in the form Rsin(š‘„ + šœƒ) with R = 5 and šœƒ = 36.9Ā°.

Therefore, the answer is (A) 5Sin(x+36.9).
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