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Grade: 11
        
Prove that tan6degree.tan42degree.tan66degree.tan78degree=1
2 months ago

Answers : (1)

Arun
17816 Points
							
 
tan6°tan42°tan66°tan78° = ?
Here we'll use the formula :
tan3x=(tanx)tan(60+x)tan(60-x)
Solution :-
  [  ( tan6°tan66°tan54°)/ tan54°]*[(tan42°tan78°tan18°)/tan18°] =1
 
Therefore the answer is 1.
2 months ago
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