Answer :

Given,


.


On comparing both sides, we have


sin2 x = cos2 x = �


Note: If we want to give solution using above two equations then task will become tedious as sin x can be positive at that time cos will be negative and similar 4-5 cases will arise. So inspite of combining all solutions at the end,we proceed as follows


combining both we can say that,


all the solutions of first 2 equations combined will satisy this single equation


tan2 x = 1



tan x = tan y, implies x = nπ + y, where n Z.



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