Expression 4: left parenthesis, "x" minus cos left parenthesis, "a" plus StartFraction, 2 pi Over 3 , EndFraction , right parenthesis , right parenthesis squared plus left parenthesis, "y" minus sin left parenthesis, "a" plus StartFraction, 2 pi Over 3 , EndFraction , right parenthesis , right parenthesis squared equals .1x−cosa+2π32+y−sina+2π32=.1
4
Expression 5: left parenthesis, "x" minus cos left parenthesis, "a" , right parenthesis , right parenthesis squared plus left parenthesis, "y" minus sin left parenthesis, "a" , right parenthesis , right parenthesis squared equals .1x−cosa2+y−sina2=.1
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Expression 6: "x" squared plus "y" squared equals .1x2+y2=.1