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#### Petrus

##### Well-known member

- Feb 21, 2013

- 739

where D is the set of all points in the first quadrant which satisfies the inequality

I am confused how to calculate the a,b \(\displaystyle \int_a^b\) (I dont know what you call that in english)

Shall I do like this

\(\displaystyle y=4-x\) and put it in the function so we get \(\displaystyle x^2(4-x)^2\) and then?