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9 FURTHER APPLICATIONS OF INTEGRATION

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How to Define π<br />

3. Using integration by parts with u = √ 1 − x 2 , show that<br />

∫ √ ∫<br />

∫<br />

1 − x 2 dx = x√<br />

1 − x 2 dx √<br />

+ √ − 1 − x 2 dx<br />

1 − x 2<br />

4. Show that the formula of Problem 2 is true.<br />

494

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