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     EduGorilla 
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    The equation 3 sin2 x + 10 cos x – 6 = 0 is satisfied, if

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    1. x = n + cos-1 (1/3)
    2. x = n - cos-1 (1/3)
    3. x = 2n + cos-1 (1/3)
    4. x = 2n + cos-1 (1/3) (n I)
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