Question

If A + B = pie/3 and cos A + cos B = 1
then
(A) cos(A – B) = 1/3
(B) cos A -cos B =root2/3
(C) cos(A – B) = -1/3
(D) cos A – cos B = 2/3​

Answer 1

Answer:

d

Step-by-step explanation:

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