1.

Find the all values of a for which every real root f the equation cos 3x = a cos x + (4-2|a|) cos ^(2) x is a root of the equation cos 3x + cos 2 x =2 cos x cos 2 x-1and vice veirs.

Answer»


ANSWER :`=> a =- 3, a =-4, a LT -5-1 lt a lt 0.`


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