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mathstina
Group Title
Evaluate the integral ∬sin(x^2+y^2 )dA where R is the region that lies above the xaxis within the circle x^2 +y^2 =16 by changing into polar coordinates.
 2 years ago
 2 years ago
mathstina Group Title
Evaluate the integral ∬sin(x^2+y^2 )dA where R is the region that lies above the xaxis within the circle x^2 +y^2 =16 by changing into polar coordinates.
 2 years ago
 2 years ago

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mathstina Group TitleBest ResponseYou've already chosen the best response.0
as for radius is from 4 to 4. for angle is from 0 to 180 ?
 2 years ago

mathstina Group TitleBest ResponseYou've already chosen the best response.0
differentiate by r dr dθ ?
 2 years ago

experimentX Group TitleBest ResponseYou've already chosen the best response.1
use radiant (0 to pi)!! and dA = r dr d(theta)
 2 years ago

mathstina Group TitleBest ResponseYou've already chosen the best response.0
ok. let me work out....
 2 years ago

experimentX Group TitleBest ResponseYou've already chosen the best response.1
\[ \int_0^4 \int_0^\pi \sin ( r^2 \cos^2 \theta + r^2 \sin^2 \theta) \; r \; dr\; d\theta \]
 2 years ago

mathstina Group TitleBest ResponseYou've already chosen the best response.0
could u pls explain to me why e radius is from 0 to 4 nt 4 to 4? and hw to get e function?
 2 years ago

mathstina Group TitleBest ResponseYou've already chosen the best response.0
ok i understood. hw abt e integration part?
 2 years ago

experimentX Group TitleBest ResponseYou've already chosen the best response.1
\[ \int_0^4 \int_0^\pi \sin ( r^2) \; r \; d\theta\; dr\ \\ \int_0^4 \sin ( r^2) \; r \; \left [ \theta \right ]_0^\pi dr\\ \] just use subs r^2 = u
 2 years ago

mathstina Group TitleBest ResponseYou've already chosen the best response.0
ok...thanks. let me work out
 2 years ago

mathstina Group TitleBest ResponseYou've already chosen the best response.0
is the ans \[ \pi \cos8
 2 years ago

mathstina Group TitleBest ResponseYou've already chosen the best response.0
\[\pi \cos 8\]
 2 years ago

mathstina Group TitleBest ResponseYou've already chosen the best response.0
am i right??
 2 years ago

experimentX Group TitleBest ResponseYou've already chosen the best response.1
http://www.wolframalpha.com/input/?i=Integrate[Integrate[Sin[r^2]r%2C+{theta%2C+0%2C+pi}]%2C+{r%2C0%2C+4}] check it out again
 2 years ago

experimentX Group TitleBest ResponseYou've already chosen the best response.1
Integrate[Integrate[Sin[r^2]r, {theta, 0, pi}], {r,0, 4}]
 2 years ago

mathstina Group TitleBest ResponseYou've already chosen the best response.0
i need guidance pls...
 2 years ago

experimentX Group TitleBest ResponseYou've already chosen the best response.1
dw:1353425265831:dw
 2 years ago

experimentX Group TitleBest ResponseYou've already chosen the best response.1
do your integration and arrive at \[ \pi [ \cos 0  \cos 16] \over 2\\ = {\pi(1  \cos 16) \over 2 }\]just use half angle formula
 2 years ago

mathstina Group TitleBest ResponseYou've already chosen the best response.0
do i need to use mehod by substitution for r^2
 2 years ago
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