Sentence:  If it is assumed that the formula given by Lodge of * * f , cosec 2lc applies , the pressure difference along the major axes can <WSD>be</WSD> calculated from the angle of inclination of the major axis , and from this the interfacial tension can be calculated . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)