Expression 3: cosine to the negative 1st power StartFraction, 64 squared plus 72 squared minus "X" squared Over 2 times 64 times 72 , EndFraction equals "A" Subscript, "C" "B" , Baselinecos−1642+722−X22·64·72=ACB
3
Expression 4: "X" equals StartRoot, 64 squared plus 72 squared minus 2 times 64 times 72cos "A" Subscript, "C" "B" , Baseline , EndRootX=642+722−2·64·72cosACB
equals=
1717
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