Posted by mabel on Monday, April 2, 2012 at 3:30am.
The triangle is bounded by
x-axis
x=1, and
y=x.
The integrals can be carried out in order dx, then dy or vice-versa.
However, integrating with respect to dy first makes for an easier integration (in the evaluation of I).
Be very sure you understand how the limits are obtained. Draw a sketch of the triangle, and follow the limits, and it will be easy to visualize how the limits can be found.
Area, A = ∫∫dxdy
Limits of integration
y from 0 to x
x from 0 to 1
Integral of values
I=∫∫xe^ydydx
within the same limits
Average value
= I/A
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