怎样把该式子化成咱们常用的分式结构？这是用matlab得到的结果。谢谢大家！(2*((2*log(w))/(c^2*w^(2*a)) + (pi*l*w^(b - a)*sin((pi*(a + b))/2))/c + (2*l*w^(b - a)*cos((pi*(a + b))/2)*log(w))/c)*(l^3*w^(3*b)*sin((pi*b)/2) + (2*l*w^(b - 2*a)*sin((pi*b)/2))/c^2 - (l^2*w^(2*b - a)*(2*sin((pi*a)/2) - sin(1/2*pi*(a + 2*b))))/c)^2)/(1/(c^2*w^(2*a)) + l^2*w^(2*b) + (2*l*w^(b - a)*cos((pi*(a + b))/2))/c)^3 - (2*(l^3*w^(3*b)*cos((pi*b)/2) + (2*l*w^(b - 2*a)*cos((pi*b)/2))/c^2 + (l^2*w^(2*b - a)*(2*cos((pi*a)/2) + cos((pi*(a + 2*b))/2)))/c)*((l^2*w^(2*b - a)*(pi*sin((pi*a)/2) + (pi*sin((pi*(a + 2*b))/2))/2))/c + (4*l*w^(b - 2*a)*cos((pi*b)/2)*log(w))/c^2 + (l^2*w^(2*b - a)*log(w)*(2*cos((pi*a)/2) + cos((pi*(a + 2*b))/2)))/c))/(1/(c^2*w^(2*a)) + l^2*w^(2*b) + (2*l*w^(b - a)*cos((pi*(a + b))/2))/c)^2 - (2*((l^2*w^(2*b - a)*(pi*cos((pi*a)/2) - (pi*cos((pi*(a + 2*b))/2))/2))/c + (4*l*w^(b - 2*a)*sin((pi*b)/2)*log(w))/c^2 - (l^2*w^(2*b - a)*log(w)*(2*sin((pi*a)/2) - sin(1/2*pi*(a + 2*b))))/c)*(l^3*w^(3*b)*sin((pi*b)/2) + (2*l*w^(b - 2*a)*sin((pi*b)/2))/c^2 - (l^2*w^(2*b - a)*(2*sin((pi*a)/2) - sin(1/2*pi*(a + 2*b))))/c))/(1/(c^2*w^(2*a)) + l^2*w^(2*b) + (2*l*w^(b - a)*cos((pi*(a + b))/2))/c)^2 + (2*(l^3*w^(3*b)*cos((pi*b)/2) + (2*l*w^(b - 2*a)*cos((pi*b)/2))/c^2 + (l^2*w^(2*b - a)*(2*cos((pi*a)/2) + cos((pi*(a + 2*b))/2)))/c)^2*((2*log(w))/(c^2*w^(2*a)) + (pi*l*w^(b - a)*sin((pi*(a + b))/2))/c + (2*l*w^(b - a)*cos((pi*(a + b))/2)*log(w))/c))/(1/(c^2*w^(2*a)) + l^2*w^(2*b) + (2*l*w^(b - a)*cos((pi*(a + b))/2))/c)^3