表达式2: 5 equals "x" squared plus "y" squared5=x2+y2
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表达式3: left parenthesis, "y" , right parenthesis "A" plus left parenthesis, 1 minus "A" , right parenthesis 5 equals left parenthesis, sin left parenthesis, "x" , right parenthesis , right parenthesis "A" plus left parenthesis, 1 minus "A" , right parenthesis left parenthesis, "x" squared plus "y" squared , right parenthesisyA+1−A5=sinxA+1−Ax2+y2
