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F1= k^2*sqrt(E*I/(mpl*L^4))/(2*pi) where k=1.875 for first natural freq and I= b*d^3/12;

OR is it

F1= k^2*sqrt(E*I/(mpl*L^4)) where k=1.875 for first natural freq and I= b*d^3/12;

Basically I am not sure why some equations have /(2*pi) while others do not and which one is correct