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I need help number 4,5 ,ty

Question

anonymous · Answer

4) The peiod is the reciprocal of frequency and vice versa ( i.e f=1/T , T=!/f)

anonymous · Answer

ty,
5) I know how to draw the graph , but I don't know compare,can you help me answer?

anonymous · Answer

ok, comparing means check the period of each plot, the capacity, the frequency

anonymous · Answer

y= cos x & 3cos x , the they are different in the amplitude only but has the same frequency and period

anonymous · Answer

cos x & cos 3x the frequency is more in cos3x nad also the period and the period will be less in cos3x

anonymous · Answer

and the same between 3cosx and cos3x , the amplitude in the first is 3 here in the second is 1. alsom the freuency in the second is more