Math problem in Huygens-Fresnel principle

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The discussion centers on the Huygens-Fresnel principle and the integration process needed to demonstrate how a spherical wave point source emits light to point P. The formula U(P)=K*∫∫U(Q)*F(θ0，θ0)*exp{ikr}/r*d∑ is highlighted, with K defined as -i/λ and F(θ0，θ0) as the inclination factor. The user expresses confusion about the integration process and seeks clarification on how to approach it, indicating a lack of understanding of the underlying concepts. Suggestions for resources or books that explain these principles more clearly are requested. Overall, the user is looking for guidance to better grasp the mathematical integration involved in the Huygens-Fresnel principle.
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in Huygens-Fresnel principle, U(P)=K*∫∫U(Q)*F(θ0，θ0)*exp{ikr}/r*d∑
K=-i/λ; F(θ0，θ0)=0.5(cosθ0+cosθ) is inclination factor; d∑ is a small part of any close surfaces; these are all include in any Beam Optics book

I want to demonstrate the spherical wave point source S gives out, all the d∑ in the spherical surface as Secondary Source, whose light come to point P, equals to S only

I don't know how to integrate,coz it seems to hard to me.
Please show the process. Any book involves is available too.Thanks
 

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I'm so confused that no one could give me any answer...Is it because I didn't get the idea through? Please let me know...thx
 
I can't understand the formula U(P)=K*∫∫U(Q)*F(θ0，θ0)*exp{ikr}/r*d∑.
Can you express it more clearly?
 
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