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Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °
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#1 2009-04-11 14:55:45
- Identity
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- Registered: 2007-04-18
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u-substitution question
When solving
,If I let
, then the limits of integration become and . Why?
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#2 2009-04-11 15:25:27
- Daniel123
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- Registered: 2007-05-23
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Re: u-substitution question
Because the area of sint cost between 0 and pi is 0 (sint cost = 1/2 sin2t)
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#3 2009-04-11 22:38:59
- JaneFairfax
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Re: u-substitution question
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#4 2009-04-11 23:58:12
- Daniel123
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Re: u-substitution question
JaneFairfax wrote:
Do you mean because
which becomes after the substitution?Offline
#5 2009-04-12 01:56:25
- JaneFairfax
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Re: u-substitution question
Precisely.
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#6 2009-04-12 03:16:08
- Identity
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- Registered: 2007-04-18
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Re: u-substitution question
Thanks both of you 
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