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प्रश्न
Evaluate: ∫ |x| dx if x < 0
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उत्तर
|x| = x; x ≥ 0
= x; x < 0
Let I = ∫ |x| dx, if x < 0
= ∫ - x dx
∴ I = `(- "x"^2)/2` + c
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