Point out how it follows from expressions (15) and ( 16)
Chapter 0, Problem 3.53(choose chapter or problem)
Point out how it follows from expressions (15) and ( 16) in Sec. 37 for I sin.:: 1 2 and jcos: 1 2 that (Cl) lsin.::I =:- lsinxl: (/>) jcos.:: I .:: jcos x I.
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