[" 18.Maximum and minimum value of "2sin...

[" 18.Maximum and minimum value of "2sin^(2)theta-3sin theta+2" is "],[[" (A) "(1)/(4),-(7)/(4)," (B) "(1)/(4),(21)/(4)," (C) "(21)/(4),-(3)/(4)," (D) "7,(7)/(8)]]

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