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cos 2x + a sin x = 2a – 7 possesses a solution for (1) all a (2) a > 6 (3) a < 2 (4) a Î [2, 6]

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cos 2x + a sin x = 2a – 7 possesses a solution for

(1) all a

(2) a > 6 

(3) a < 2

(4) a Î [2, 6]

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Correct option (4) a Î [2, 6]

Explanation :

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