Expression 5: "t" equals arc tangent left parenthesis, StartFraction, "h" Over "l" minus "x" , EndFraction , right parenthesist=arctanhl−x
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Expression 6: "c" equals "l" minus 1 half "l" times cosine "t"c=l−12l·cost
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Expression 7: "F" equals "w" times StartFraction, "l" minus "c" Over "l" minus "x" plus "a" , EndFraction Has graph. To audio trace, press ALT+T.F=w·l−cl−x+a