Expression 17: "f" left parenthesis, "x" , right parenthesis equals "m" Subscript, 1 , Baseline left parenthesis, "x" minus "B" Subscript, 1 , Baseline , right parenthesisfx=m1x−B1
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Expression 18: "g" left parenthesis, "x" , right parenthesis equals StartRoot, "R" squared minus "x" squared , EndRootgx=R2−x2
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Expression 19: "f" left parenthesis, "D" Subscript, 1 , Baseline , right parenthesis tilde "g" left parenthesis, "D" Subscript, 1 , Baseline , right parenthesisfD1~gD1
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Expression 20: "D" Subscript, 2 , Baseline equals "g" left parenthesis, "D" Subscript, 1 , Baseline , right parenthesisD2=gD1