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forall x in R sin^2 x + cos^4x € [P,Q] t...

`forall x in R` `sin^2 x + cos^4x € [P,Q]` then `(1).7P+Q=4` `(2).4P+Q = 4 ` `(3).Q-P=1/4` `(4).P=3/4,Q=1/4`

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