Question: Use the trigonometrical identities to expand and simplify if possible. (a) (i) cos(270° –  )

(ii) sin(270° –  )

(iii) cos(270° +  )

(b) The voltage V 1 and V 2 are represented by as follows,

V 1 

V 2 

3sin   t 

2 cos  t 

If V 3 is the sum of V 1 and V 2 ,

V 3  V 1  V 2

Find the expression of V 3 in sine waveform

V 3 

R sin  t

  

and verify that the resultant voltage V 3 is in the same frequency as V 1

and V 2 .

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