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I am calculating some integrals in 3 dimensions. However, the difficulties of such integrals lie in the determination of the boundaries of the variables integrated over.

[itex]\int_{C} d^{3}\vec{t}[/itex] e[itex]^{-\vec{s}.\vec{t}}[/itex]

For example, if we consider (C) as the region of the intersection of 2 spheres:

C=|[itex]\vec{s}[/itex]-[itex]\vec{t}[/itex]|<1 and |[itex]\vec{s}[/itex]+[itex]\vec{t}[/itex]|<1

I want to solve these set of inequalities for fixed [itex]\vec{s}[/itex], using spherical coordinates.

i.e. determine the interval over |[itex]\vec{t}[/itex]|, [itex]\phi[/itex] and [itex]\vartheta[/itex]=angle([itex]\vec{s}[/itex],[itex]\vec{t}[/itex])

Does anyone have a strategy to deal with such inequalities?

Thanks in advance.[itex]^{}[/itex]