Solve :
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.
∴