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`        Let z1,z2,z3 be three points on |z|=1.If Θ1,Θ2,Θ3 be the arguments of z1,z2,z3 respectively then cos(Θ1-Θ2)+cos(Θ2-Θ3)+cos (Θ3-Θ1)a. >=-3/2b. <=-3/2c.>=3/2d. none`
7 years ago

147 Points
```										Dear Vaibhay
In the question nothing is given about Θ1,Θ2,Θ3
so choose any  value of Θ1,Θ2,Θ3
let Θ1,Θ2,Θ3  are nearly equal so
(Θ1-Θ2)≈0
(Θ2-Θ3)≈0
(Θ3-Θ1)≈0
so cos(Θ1-Θ2)+cos(Θ2-Θ3)+cos  (Θ3-Θ1) ≈3
option a and c  are correct
similerly we can choose other  angel also
Please feel free to post as many  doubts on our discussion forum as you can. If you find any question Difficult to understand - post it here and we  will get you  the answer and detailed  solution very  quickly.   We are all IITians and here to help you in your IIT JEE preparation.  All the best.   Regards, Askiitians Experts Badiuddin

```
7 years ago
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