Question

I am confused how to start !!!

Answer 1

@pooja195

Answer 2

This looks neat! :o

Answer 3

okay !! How should I proceed ??

Answer 4

I don't know :p, lets try a+b+c=abc

Answer 5

\[a+b+c = (\cos \theta_1 +isin \theta_1)+(\cos \theta_2+isin \theta_2)+(\cos \theta_3+i \sin \theta_3)\]

Answer 6

What will abc give? Did you try messing around with this

Answer 7

Mhm Euler was a nifty fella

Answer 8

yeah i did try this step but i am left with cos t1+ cos t2 + cos t3 = cos (t1+t2+t3) for simplicity I replaced theta1,2,3 with t1,2,3

Answer 9

similarly for the sine as well..

Answer 10

you need to know formula of co(A-B) = cos A*cos B +sin A*sin B

use this and hope helped