表达式19: polygon left parenthesis, "A" , "B" , "C" , "D" , right parenthesispolygonA,B,C,D
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表达式20: polygon left parenthesis, "A" , "B" , "C" , "D" , right parenthesispolygonA,B,C,D
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表达式21: left parenthesis, "C" Subscript, 1 , Baseline plus "R" cos "t" , "C" Subscript, 2 , Baseline plus "R" sin "t" , right parenthesisC1+Rcost,C2+Rsint
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表达式22: left parenthesis, "M" Subscript, 1 , Baseline plus "R" Subscript, 1 , Baseline cos "t" , "M" Subscript, 2 , Baseline plus "R" Subscript, 1 , Baseline sin "t" , right parenthesisM1+R1cost,M2+R1sint