Expression 5: left brace, negative cos left parenthesis, StartFraction, pi Over 8 , EndFraction , right parenthesis less than "x" less than cos left parenthesis, StartFraction, pi Over 8 , EndFraction , right parenthesis : negative tan left parenthesis, StartFraction, pi Over 8 , EndFraction , right parenthesis "x" , right brace−cosπ8<x<cosπ8:−tanπ8x
5
Expression 6: left brace, negative cos left parenthesis, StartFraction, 3 pi Over 8 , EndFraction , right parenthesis less than "x" less than cos left parenthesis, StartFraction, 3 pi Over 8 , EndFraction , right parenthesis : tan left parenthesis, StartFraction, 3 pi Over 8 , EndFraction , right parenthesis "x" , right brace−cos3π8<x<cos3π8:tan3π8x
6
Expression 7: left brace, negative cos left parenthesis, StartFraction, 3 pi Over 8 , EndFraction , right parenthesis less than "x" less than cos left parenthesis, StartFraction, 3 pi Over 8 , EndFraction , right parenthesis : negative tan left parenthesis, StartFraction, 3 pi Over 8 , EndFraction , right parenthesis "x" , right brace−cos3π8<x<cos3π8:−tan3π8x
7
Expression 8: left brace, negative 1 less than "x" less than 1 : 0 , right brace−1<x<1:0
8
Expression 9: "x" equals 0 left brace, negative 1 less than "y" less than 1 , right bracex=0−1<y<1