Expression 2: arc tangent left parenthesis, "a" times sin left parenthesis, "x" , right parenthesis , right parenthesisarctana·sinx
2
Expression 3: "a" equals tangent left parenthesis, StartFraction, pi Over 2 , EndFraction times StartFraction, left bracket, 0 , ... , "N" , right bracket Over "N" , EndFraction , right parenthesisa=tanπ2·0,...,NN