Question: If 5(tan 2 x cos 2 x) = 2cos 2x + 9, then the value of cos 4x is : (a) 1/3 (b) 2/9

If 5(tan2 x – cos2 x) = 2cos 2x + 9, then the value of cos 4x is :

(a) 1/3

(b) 2/9

(c) -7/9

(d) -3/5

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