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18.. Maximum and minimum value of 2sin^2...

18.. Maximum and minimum value of `2sin^2theta-3sintheta+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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A
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