hi, i have an example

it become

which later becomes

why is this so?

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- May 21st 2011, 12:25 AMsalohcinseahTrigonometric substitution.
hi, i have an example

it become

which later becomes

why is this so? - May 21st 2011, 12:39 AMChris L T521
- May 21st 2011, 12:54 AMsalohcinseah
yes, i understand now , the example skip a few step which make me lost