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Arg of sin(16∏/15)+i(1+ cos(16∏/15)

Arg of sin(16∏/15)+i(1+ cos(16∏/15)

Grade:12

1 Answers

Pratham Ashish
17 Points
11 years ago

hi

here u can write 1+ cos(16∏/15) = 2cos2 (8∏/15) ......[1+cosx = 2cos^2(x/2).................]

also write sin(16∏/15) = 2sin(8∏/15)cos(8∏/15)

now d expression becomes

2cos(8∏/15)[sin(8∏/15) +i cos(8∏/15) ]


so ur arg wud be simply 8∏/15

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