Math problem in 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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