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Question

If the equation asinx + cos2x = 2a–7 possesses a solution then a ϵ


A
(0, 4)
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B
(2, )
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C
[2, 11]
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D
[2, 6]
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Solution

The correct option is B [2, 6]
2 sin2xa sin x+(2a8)=0
sin x=a±(a8)4sin x=a42
1a4211aϵ[2,6]

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