I need the answer as soon as possible How did the negativesign appear?To prove cos (iz)= cos h (z)sincecos h (x) :e+e-*and cos (x)eix +e-ixLHS=cos (iz) :eiliz) +e¬i(iz)-e-?+e?2e+e-zRHS=cos h (z)2Since, LHS=RHS.It can be proved thatcos (iz) = cos h (z)

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Answered: How did the negative sign appear? To…

Calculus: Early Transcendentals

8th Edition

ISBN:9781285741550

Author:James Stewart

Publisher:James Stewart

Chapter1: Functions And Models

Section: Chapter Questions

Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...

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How did the negative sign appear? To prove cos (iz) = cos h (z) = cos since et+e¬* eix +e-ix cos h (x) and cos (x) = 2 2 LHS=cos (iz) e(12) +e-i(iz) -e-+e? 2 2 RHS=cos h (z) : e+e=? Since, LHS=RHS.