June 29th, 2017, 05:09 AM  #1 
Member Joined: May 2017 From: Slovenia Posts: 87 Thanks: 0  Triple integral
Okay so I have given the following problem and the solutions says that the angle phi is between pi/2 and pi/2 and I'm not sure how do we get that? I'm asked to find the mass.

June 29th, 2017, 07:28 AM  #2 
Senior Member Joined: Dec 2012 From: Hong Kong Posts: 853 Thanks: 311 Math Focus: Stochastic processes, statistical inference, data mining, computational linguistics  It's a good idea to get an impression of what the inequalities look like by plotting a few points. The base $\displaystyle x^2 + y^2 \leq x$ happens to refer to the unit closed disk centered at $\displaystyle (1, 0)$, occuping the first and fourth quadrants. hence the angle.


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integral, triple 
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