Cot. Cot(60 -A). Cot (60 + A) = Cot 3A
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Step-by-step explanation:
find
1. sinA sin (60+A)sin(60-A) = 1/4 sin3A.
2.cos cos(60-A) cos(60+A)=1/4 cos3A.
then divide 2 from 1 to get
cotA cot(60+A)cot(60-A)= cot3A
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