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If A = sin^2x + cos^4 x, then for all re...

If `A = sin^2x + 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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