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ELEN [110]
3 years ago
12

Cos (A − B)

Mathematics
1 answer:
iVinArrow [24]3 years ago
4 0
Answer is choice C) cosine is even; sine is odd

The properties that come with even and odd functions are...
f(-x) = f(x) indicates we have an even function. So cos(-x) = cos(x)
f(-x) = -f(x) indicates we have an odd function. So sin(-x) = -sin(x)

note: the end result of the proof will lead to cos(A)cos(B)+sin(A)sin(B)
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