Wyrażenie 2: polygon left parenthesis, left parenthesis, cos left parenthesis, "a" StartFraction, 2 pi Over "n" , EndFraction , right parenthesis , sin left parenthesis, "b" StartFraction, 2 pi Over "n" , EndFraction , right parenthesis , right parenthesis , right parenthesispolygoncosa2πn,sinb2πn