用C语言写了个数学公式出现error C2064:term does not evaluate to a functiondouble N,Ra,S,S12;S12=579.5888;N=a*a/(b*sqrt(1+e12*cos(B1)*cos(B1)));Ra=N/(1+e12*cos(B1)*cos(B1)*cos(A1)*cos(A1));S=S12*sqrt((1-(H2-H1)*(H2-H1)/(S12*S12))/((1+H1/Ra)

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