Expression 22: left parenthesis, "x" minus "A" Subscript, 1 , Baseline , right parenthesis tangent "B" Subscript, "O" "C" , Baseline equals StartRoot, "R" squared minus "x" squared , EndRootx−A1tanBOC=R2−x2
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Expression 23: "a" "x" squared plus "b" "x" plus "c" equals 0ax2+bx+c=0
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Expression 24: "D" Subscript, 1 , Baseline equals StartFraction, negative "b" plus StartRoot, "b" squared minus 4 "a" "c" , EndRoot Over 2 "a" , EndFractionD1=−b+b2−4ac2a
