Expression 4: tangent to the negative 1st power StartFraction, "H" Over 6 , EndFraction tilde tangent to the negative 1st power StartFraction, 3 Over "H" , EndFraction minus tangent to the negative 1st power StartFraction, 1 Over "H" , EndFractiontan−1H6~tan−13H−tan−11H
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center: left parenthesis, 0 , 0 , right parenthesis0,0