Single Answer MCQ
Q-00051651
What is the identity for cos(x + y)?
1
cos(x) + cos(y)
2
sin(x)sin(y)
3
cos(x)cos(y) - sin(x)sin(y)
4
cos(x)cos(y) + sin(x)sin(y)
Answer and Solution
Answer
C. cos(x)cos(y) - sin(x)sin(y)
Solution:
The cosine addition formula states that cos(x + y) = cos(x)cos(y) - sin(x)sin(y).
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