Prove the spherical harmonic addition theorem (where (theta_{12} equiv theta_{1}-theta_{2}) ), by coupling two spherical harmonics to

Question:

Prove the spherical harmonic addition theorem

image text in transcribed

(where \(\theta_{12} \equiv \theta_{1}-\theta_{2}\) ), by coupling two spherical harmonics to an \(\operatorname{SO}(3)\) scalar and invoking the invariance of that scalar under rotations.

Fantastic news! We've Found the answer you've been seeking!

Step by Step Answer:

Question Posted: