# Particular Integrals?

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Im trying to solve this
y' = radq(y/x)
whith [y(1) = 4]
i have found the integration ... and its [ y = x (c2/4)] or [y = (sqrt(x) (c/2))]
but the problem is with the C value ... when i try to find it .... it gives me a different vlue than the value which is on the book answers ..
the book answer is [y = (sqrt(x) 1)2]
i have already done many others particular Integrals .. in which the C was not touched .. i mean that C was just a simple C ... not a C2 ... and there the answers were right ...but not here ..
Can some one help me
im a newbie ... sorry for my english ...
edit : Can any one tell me how to find the value of ""t"" in this equation :
ln(sqrt(1/2t)) = ( ln|x| ) c ---- the same problem ... i dont understand if when i raise the ln equation to "e" .. do i have to raise the C too .. or not ..
do i have to do like :
eln(sqrt(1/2t)) = eln|x| ec
or
eln(sqrt(1/2t)) = eln|x| c ?????
how do i have to procede to get the "t&
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