Expression 1: ( 1 / 2 ) Superscript, "y" , Baseline plus ( 1 / 2 ) Superscript, "y" , Baseline plus ( tangent left parenthesis, "x" , right parenthesis / 2 ) Superscript, "y" , Baseline plus ( tangent left parenthesis, "x" , right parenthesis / 2 ) Superscript, "y" , Baseline equals 1 left brace, 0 less than "x" less than StartFraction, pi Over 4 , EndFraction , right brace(1/2)y+(1/2)y+(tanx/2)y+(tanx/2)y=10<x<π4