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Check Cos(ne)= Cea (n(etsT) Peasoni Caslnle+am)) = Coa(ne +na) %3D

Check Cos(ne)= Cea (n(etsT) Peasoni Caslnle+am)) = Coa(ne +na) %3D

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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I don't understand why cos(ntheta+ n2pi)=cos(ntheta). Can you please explain it to me? Thank you 

Consider °S"+\S=0 s(8)= Ci+C O > Ca=0 IS(0)=Ci S6) = C, cosh(we) + Cadinhko) >Not peicodlc , don't consicler 310)=5(0+TT) uill hold if (neN) %3D n=1,2,3. Chak Cos(ne) = ces (n(otST)) Peason: Caolnl0+a)) = Cos(ne %3D = cos(no)
Transcribed Image Text:Consider °S"+\S=0 s(8)= Ci+C O > Ca=0 IS(0)=Ci S6) = C, cosh(we) + Cadinhko) >Not peicodlc , don't consicler 310)=5(0+TT) uill hold if (neN) %3D n=1,2,3. Chak Cos(ne) = ces (n(otST)) Peason: Caolnl0+a)) = Cos(ne %3D = cos(no)
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