Expression 5: "y" minus StartFraction, pi Over 4 , EndFraction equals negative 2 left parenthesis, "x" minus 1 , right parenthesisy−π4=−2x−1
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Expression 6: "y" left parenthesis, tan to the negative 1st power left parenthesis, "x" , right parenthesis minus "y" , right parenthesis left parenthesis, negative 2 "x" plus 2 plus StartFraction, pi Over 4 , EndFraction minus "y" , right parenthesis greater than 0 left brace, 0 less than or equal to "x" less than or equal to 1 plus StartFraction, pi Over 8 , EndFraction , right brace left brace, 0 less than or equal to "y" less than or equal to StartFraction, pi Over 4 , EndFraction , right braceytan−1x−y−2x+2+π4−y>00≤x≤1+π80≤y≤π4
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Expression 7: "y" equals StartFraction, 1 Over 1 plus "x" squared , EndFractiony=11+x2
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Expression 8: 0 less than or equal to "y" less than or equal to StartFraction, 1 Over 1 plus "x" squared , EndFraction left brace, 0 less than or equal to "x" less than or equal to "k" , right brace0≤y≤11+x20≤x≤k