if arc cos[p] +arc cos[q] +arc cos[r] =180,//<![CDATA[ aax_getad_mpb({ "slot_uuid":"f485bc30-20f5-4c34-b261-5f2d6f6142cb" }); //]]>

prove that psquared +qsquared +rsquared +2pqr =1

i need a comprehensive solution

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# Prove that psquared +qsquared +rsquared +2pqr =1

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