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Published online by Cambridge University Press: 20 January 2009
Taking the three addition theorems and clearing away the fractions,
Let
Substitute in (1) (2) (3) the expansions for sinx, siny, cosx, cosy, , dn x, dn y, , and then pick out the coefficients of y in (1), (2), (3). Then equate the like powers of x in the resulting series.