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Grade: 11
        
If mtan(theta -30) =n tan(theta+120) prove that cos2theta= (m+n)/2(m-n)
7 months ago

Answers : (1)

Arun
20913 Points
							
Dear student
 
Just open the formula of both the sides
 
m ( (tan theta - 1/sqrt3)/1 + (1/sqrt3)) = n ( (tan theta +1/sqrt3) / 1 - (1/sqrt3))
 
Just cross multiply and simplify...you will clearly get your answer
7 months ago
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