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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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