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∫

_{0}

^{2∏}∫

_{0}

^{α}sin[itex]\varphi[/itex]d[itex]\theta[/itex]d[itex]\varphi[/itex]

However, what if the central axis is align to y-axis horizontally, instead of z-axis.

My question is with angle 2α, if the central axis goes through (θ

_{0}, [itex]\varphi[/itex]

_{0}), then how to set the intragation boundaries? It should give the same answer but I need to now how to set up the equation. Can one still use spherical coordinate?

Thank you so much if I get some help.

Best,

Charles