Nyquist Diagram in Linear Control System

baby_1

I have so much problem in draw nyquist diagram. here is some problem

1-as the book mentioned the open- transfer function doesn't have any pole and zero in right of S plane. and give me the uncompleted diagram

so i completed it as you see , but my answer is different form the book !!!! what is my wrong?



and other question:
2-here is uncompleted diagrams

i completed and solved with this view

but one of the answers is wrong .... now what is my problem?!!!!

how can i find the best videos references about nyquist in Linear Control System ?

Thanks