find the maximum positive value of the following expression 9[(1/sec)^2x+sin^2(π/2-x)]+9(x^2-9/x-3)-3x
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gduririrhdieueuririruhrirrvxhdhdhddhdghdhdgrgdhudhdhdgdgxghdjdhhdhehdhfhfhhjffhhfddhhfhdhdhddhdhdhdndbdjjdjfddddhdhfhfhfhhdhdjdjfhdhjdhdhdjfhdhdjdjfhhfjfudgjwodzf
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