Write sinh:. = sinh(x + iy) and cosh:. = cosh(x + iy ).
Chapter 0, Problem 3.65(choose chapter or problem)
Write sinh:. = sinh(x + iy) and cosh:. = cosh(x + iy ). and then show how expressions (9) and (I 0) in Sec. 39 follow from idem itics (7) ;md (8). respect ivcly. in that section.
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