Mathematics
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OpenStudy (anonymous):
find integral of (xcube-1)raiseto1/3*xraiseto5
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OpenStudy (anonymous):
( x^3 - 1) / 3 x^5
OpenStudy (anonymous):
is this d Q?
OpenStudy (anonymous):
how did u do it?!?
OpenStudy (anonymous):
i didnt solve yet...i have written d integrand again...is it right?
OpenStudy (anonymous):
exactly i dont know
...thats why im asking u how u did it
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OpenStudy (anonymous):
(xcube-1)raiseto1/3*xraiseto5 = ( x^3 - 1) / 3 x^5 ????
OpenStudy (anonymous):
yes
OpenStudy (anonymous):
ok
OpenStudy (anonymous):
thts the question
OpenStudy (anonymous):
( x^3 - 1) / 3 x^5
= 1/3 x^(-2) - 3 x^(-5)
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OpenStudy (anonymous):
1/3 x^(-2) - 1/3 x^(-5)
OpenStudy (anonymous):
theres one more..
fine integral of 1+cosAcosx/cosA+cosx ....(A is a constant!)
OpenStudy (anonymous):
(1+cosAcosx)/ (cosA+cosx) ???
OpenStudy (anonymous):
1/3 is raise to that whole x^3-1
OpenStudy (anonymous):
yes
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OpenStudy (anonymous):
(1/3) x^(-2) - (1/3 )x^(-5) but it's not d answer...u have to integrate it using integration of x^n = x^(n+1)/(n+1)
OpenStudy (anonymous):
k..
OpenStudy (anonymous):
is it substitution,by parts or what?!
OpenStudy (lgbasallote):
\[\Large \int (x^3 - 1)^{\frac 13} x^5 dx\]
let \[u = x^3 - 1\]
\[du = 3x^2dx\]
so the integral becomes
\[\Large \implies \frac 13 \int u^{\frac 13} du \times (u-1)\]
so if you simplify...
\[\Large \implies \frac 13 \int (u^{\frac 43} - u ^{\frac 13})du\]
OpenStudy (lgbasallote):
uhh wait..that should be + not -
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OpenStudy (anonymous):
(xcube-1)raiseto1/3*xraiseto5
OpenStudy (anonymous):
wait...check d question again..
OpenStudy (anonymous):
there is no 1/3 rd power ...
OpenStudy (anonymous):
ill check
OpenStudy (lgbasallote):
raise to 1/3 means ^1/3
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OpenStudy (anonymous):
yes
OpenStudy (anonymous):
oh...yes...sorry
OpenStudy (anonymous):
question is right
OpenStudy (lgbasallote):
anyway...like i was saying..should be + not - in my last line \[\huge \implies \frac 13 \int (u^{\frac 43} + u^{\frac 13})du\]
OpenStudy (anonymous):
yes...lgbasallote is right
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OpenStudy (lgbasallote):
now integrate that
OpenStudy (anonymous):
k
OpenStudy (anonymous):
thx
OpenStudy (lgbasallote):
welcome