1.

If √3 cot A=3 then find the value of cos 2a​

Answer»

cot A = 3/√3 => cot A = √3 => cot A = cot 30°On COMPARING LHS and RHS of above EQUATION,Angle A = 30°=> 2A = 60°=> cos 2A = cos 60°=> cos 2A = 1/2



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