For all values of A ,B ,Ca n dP ,Q ,R sh...

For all values of `A ,B ,Ca n dP ,Q ,R` show that `|"cos"(A-P)"cos"(A-Q)"cos"(A-R)"cos"(B-P)"cos"(B-Q)"cos"(B-R)"cos"(C-P)"cos"(C-Q)"cos"(C-R)|=0`

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