Question: 14. Show that | sinh z|2 = sinh x + sin y, | cosh 2 2 = sinh x + cosy, and hence deduce that

14. Show that | sinh z|2 = sinh x + sin y, | cosh 2 2 = sinh x + cosy, and hence deduce that | sinh z) and | cosh z] are unbounded as x - too for fixed y. In Exercises 15-18 find the indicated derivative. Express final answers in Cartesian form. 15. f'(2 + i) if f(2) = sinh (3z + 1 +2) 16. f'(i) if f(2) = tanh 3z 17. f'(1) if f( z) = z coshiz 18. f"(-2i) if f(z) = sech(3z + i)

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