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INTEGRATION QUESTIONS!

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SGVaibhav:
Guys i have many doubts in integration
i will not be posting them, because they r quite long, so leave those.

now i will put a small doubt that i have.

im posting it in a pic


i do not understand how does the number which comes out is 2??
the number which comes out is supposed to be 4 actually ???

the stuff  // steps i have written is 100 % correct ...

HOW HOW HOW ???

please help fast, because i have a test coming up, and this concept will affect the stuff i learn after this

XIII_BD:
well u cn take 4 common frm within the square root out! root over 4 means 2. and there is no integration of 2. so it goes outside the integration sign!

SGVaibhav:
np, thanks  for help
i got it solved, when i asked this question in another thread.

SGVaibhav:
Help me to integrate this question



It was solved in our class by completing the sqaure, but i did not understand :( :( :(

astarmathsandphysics:
Half hour

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