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==useful relations==odd and even functions::formula_17hence::formula_18it can be seen that cosh "x" and sech "x" are even functions; the others are odd functions.
== yararlı bağıntılar ==:formula_13:formula_14dolayısıyla::formula_15:formula_16:formula_17:formula_18cosh "x" ve sech "x" çift fonksiyon, diğerleri tek fonksiyondur.