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If 5 ( tan^2 x - cos^2 x) = 2 cos 2x +9, then the value of cos 4x is (a) -3/5 (b) 1/3 (c) 2/9 (d) -7/9

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

(a) -3/5

(b) 1/3

(c) 2/9

(d) -7/9

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The correct option is (d) -7/9

Explanation:

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