matlab中 sqrt(1+(cos（x）)^2)的积分

matlab中 sqrt(1+(cos（x）)^2)的积分>> fun=inline('sqrt(1+(cos（x）)^2)')fun =Inline function:fun(cos,x) = sqrt(1+(cos（x）)^2)>> [R,k,T]=Romberg(fun,realmin,4,1e-6)Error using ==> inline.subsrefNot enough inputs to inline function.Error in ==> Romberg at 13T=h/2*(fun(a)+fun(b));>> syms x>> fun=sqrt(1+(cos(x))^2)fun =(1+cos(x)^2)^(1/2)>> [R,k,T]=Romberg(fun,0,4,1e-6)Subscript indices must either be real positive integers or logicals.Error in ==> Romberg at 13T=h/2*(fun(a)+fun(b));