IIT-JEE Advance (2023) Trigonometry Series Question-4

[@shreyanshpatel0707]

I did it !!

[@godlygodofgodliness4550]

thank you sir

[@TELUKUNTA.]

How to know wheather we should square and add first and second equation or multiple or subtract

[@shivratanyadav8307]

Source pls

[@SRIRAM-je8hr]

I did it in another method, For sinx+Siny and cosx+cosy I applied transformations and divided them to obtain a/b Tan(x+y/2)=a/b So sin(x+y/2)=a/root( a^2+b^2) Then I substituted it in sinx+siny=a to get cos(x-y/2)=root(a^2+b^2)/2 Then I substituted the values in tanx+tany=c to obtain LHS BTW I am in 10th class

[@zelinski3693]

Sir what is the source of these qusetions ?

[@neetugmagawer1691]

Thanks

[@papansaha2658]

thanks

[@jayasati]

Thank u sir

[@prathamrana8916]

Thanks sir 🥰