cos A + cos
(120+A) + Cos(120-A)
Answers
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0
Step-by-step explanation:
Cos A + cos(120° + A) + cos(120 - A)
= Cos A + 2 cos{( 120°+A+120°-A)/2}cos{120°+A-120+A)/2 ………(1) by using the formula
Cos C + cos D = 2 cos (C+D)/2 cos (C-D)/2
(1) reduces to Cos A + 2 cos 120° cos A
= Cos A + 2 (-1/2) cos A
= 0
Answered by
0
Answer:
answer is 0
cosA+cos
(120+A)+Cos(120-A)
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