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Question

cos 2x + a sin x = 2a – 7 has a solution if


A
a = 0
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B
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C
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D
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Solution

The correct option is C
cos2x+αsinx=2a712sin2x+asinx=2a72sin2xasinx+2a8=0sinx=a±a28(2a8)4=a±(a8)4sinx=a421a4212a422a6

Mathematics

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