Happy new year for you all,(adsbygoogle = window.adsbygoogle || []).push({});

This is very nice place, So girls and boys, let me give you something to play with:

Integrate (r^.a)(r^.b)(r^.c)(r^.d) d(cos8)

from cos8=1 to cos8=-1.

a,b,c and d are constant vectors,r^is the unit vector

(iX+jY+kZ)/|r|, 8 is the spherical angle betweenr^and Z-axis.

The dot represents the scalar product.

When you have done that, do this one:

(a.r^)/(1+K.r^) d(cos8)

the limits of integration same as befor, a and K are constant vectors.

cheers

sam

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# Integrate This

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