answer the question.......
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cos(a+b)=cosa cosb -sina sin b
here a = π/3 and b = A
then cos(π/3 +A)= 1/2.cosA - √3/2sinA
then 2 cos(π/3 +A) = cosA -√3sinA
is the required answer
here a = π/3 and b = A
then cos(π/3 +A)= 1/2.cosA - √3/2sinA
then 2 cos(π/3 +A) = cosA -√3sinA
is the required answer
Answered by
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answer is A...hope it helped
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