Hi there, Please, need help for these exercice,and step by step that I can under

Question

Hi there,                 

Please, need help for these exercice,and step by step that I can understand.                 

Thank you

W is OMEGA                 

                    2- Determine the phase angles between the following sets of functions an indicate which one is leading in each case.
                    a)e1=80sin wt , e2=20cos wt
                    b)e1=18 sin wt, e2=9sin(wt + 120 degree)
                    c) i1=2cos(wt - 10 degree), i2=4cos(wt - 60 degree)
                    d) i1=5sin(wt + 30 degree) i2=3sin(wt - 80 degree)

Explanation / Answer

90

120

50

110

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