(a) cos(iz) = cos(iz) (b) sin(iz) = sin (iz) for all z; if and only if z = nлi (n = 0, +1, +2, ...).

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter7: Distance And Approximation
Section7.5: Applications
Problem 17EQ
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14. Show that
(a) cos(iz) = cos(iz)
(b) sin(iz) = sin(iz)
for all z;
if and only if z = nлi (n = 0, +1, +2, ...).
Transcribed Image Text:14. Show that (a) cos(iz) = cos(iz) (b) sin(iz) = sin(iz) for all z; if and only if z = nлi (n = 0, +1, +2, ...).
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