SOLUTION: by using formula cos A = underroot 1+ 2 cos 2A upon 2 find the value of cos 30 it being given that cos 60= 1/2
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Question 984641: by using formula cos A = underroot 1+ 2 cos 2A upon 2 find the value of cos 30 it being given that cos 60= 1/2
Answer by srinivas.g(540) (Show Source): You can put this solution on YOUR website!
put A=30
then
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