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If A=sin^(2)x+cos^(4)x, then for all rea...

If `A=sin^(2)x+cos^(4)x`, then for all real x

A

`(3)/(4) le A le 1`

B

`(13)/(16) le A le 1`

C

`1 le A le 2`

D

`(3)/(4) le A le (13)/(16)`

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