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= - x² .cos x + 2 (x .sin x + cos x) ... dgn batas π dan 0
= [-π² .cos π + 2(π.sin π + cos π ] - [ - 0² .cos 0 + 2(0 .sin o + cos 0]
= [ - π² . (- 1) + 2 (π .0 + ( - 1) ] - [ ( 0 + 2 ( 0 + ( - 1) ]
= [π² + 2 (- 1) ] - [ 0 + (- 2 )]
= π² - 2 + 2
= π²