alleryStart learning →Which identity gives cos(A − B) for any two angles A and B?
AsinA cosB + cosA sinB
BcosA cosB − sinA sinB
CcosA cosB + sinA sinB
DsinA cosB − cosA sinB
Answer & Solution
Correct answer: C. cosA cosB + sinA sinB
Using the distance between two points on the unit circle, cos(A − B) works out to cosA cosB + sinA sinB.
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