A=30 degrees; B=30 degrees ;g*a* cos(A)/(sin(A))^2*(2*(tan(A))^2*(tan(B))^2*(tan(A)+tan(B)))/((tan(A))^2-2*tan(A)*(tan(B))^3-(tan(B))^2-2*(tan(A))^2*(tan(B))^2)

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