Arg of sin(16∏/15)+i(1+ cos(16∏/15)

Question

Arg of sin(16&prod;/15)+i(1+ cos(16&prod;/15)

Pratham Ashish · Answer

hi here u can write 1+ cos(16&prod;/15) = 2cos 2 (8&prod;/15) ......[1+cosx = 2cos^2(x/2).................] also write sin(16&prod;/15) = 2sin(8&prod;/15)cos(8&prod;/15) now d expression becomes 2cos(8&prod;/15)[sin(8&prod;/15) +i cos(8&prod;/15) ] so ur arg wud be simply 8&prod;/15

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Arg of sin(16∏/15)+i(1+ cos(16∏/15)

Arg of sin(16∏/15)+i(1+ cos(16∏/15)

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