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# Post a solution

A complex number z is such that $$arg(\frac{z-2}{z+2})=\frac{\pi}{3}$$. The points representing this complex number lie on what?? straight line or circle or parabola or ellipse.

The centres of a set of circles, each of radius 3, lie on the circle $$x^2+y^2 = 25$$. The locus of any point in the set is

Find sum of this series $$\displaystyle \sum_{r=0}^{n} (-1)^{r}$$ $$^{ n }{ { { C } } }_{ r } (\frac{1}{2r}+\frac{3^r}{2^{2r}}+\frac{7^r}{2^{3r}}+\frac{15^r}{2^{4r}}.......m~terms)$$

Note by Tanishq Varshney
2 years, 8 months ago

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Should the first problem be: $$arg((z-2)/(z+2))=\pi/3$$? Then the locus is a part of a circle.

- 2 years, 8 months ago

yes then its easy, The question was misprinted .

- 2 years, 8 months ago

With z the equation is dimensionally incorrect.

- 2 years, 8 months ago

- 2 years, 8 months ago