MathSciNet bibliographic data MR418401 (54 #6442) 65A05 Fettis, Henry E. Complex roots of ${\rm sin}$${\rm sin}$ $z=az,$$z=az,$ ${\rm cos}$${\rm cos}$ $z=az,$$z=az,$ and ${\rm cosh}$${\rm cosh}$ $z=az$$z=az$. Math. Comp. 30 (1976), no. 135, 541–545. Article

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