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Express the complex number in trigonometric form. -2

2 Answers

z=-2+0i

a = -2 ,b=0

r =√(a^2+b^2)

=√(-2)^2+(0)^2

=2

θ =π+tan^-1(b/a) when a<0

=π+tan^-1(0/-2)

=π+0

=π

Trignometric form

z=r(cosθ+isinθ)

=2(cosπ+isinπ)

answered Jul 30, 2014 by bradely Mentor
reshown Aug 1, 2014 by bradely

i'm not sure that is completly right, could you check to see if you somehow made a mistake?

commented Jul 30, 2014 by Tdog79 Pupil

What is u r text book back side answer

commented Jul 30, 2014 by bradely Mentor

i think it is correct

commented Jul 30, 2014 by bradely Mentor

2 sqrt2 (cos(7pi/4) + isin (7pi/4))

commented Jul 30, 2014 by Tdog79 Pupil

I think u r question wrong

I think Question is 2-2i not -2

commented Jul 30, 2014 by bradely Mentor

The complex number is

The polar form of complex number

Find the absolute value of r.

Now find the argument

Since a > 0

Trigonometric form of is

answered Jul 30, 2014 by david Expert
edited Jul 30, 2014 by david

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