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1. Së GD & §t nghÖ an Tr−êng THPT §Æng thóc høa ∫ 6 6 sin4x + cos2x dx sin x + cos x tÝch ph©n ( ) ( ) ∫ ∫ 6 6 8 8 x +1 - x -1dx 1 = = dx x +1 2 x +1…