Prove that
…(1)
Use King theorem of definite integral
…(2)
Adding eq.(1) and eq.(2)
We break it in two parts
Let, tan x = t
⇒ sec2x dx = dt
At x = 0, t = 0
At x = π, t = 0
We know that when upper and lower limit is same in definite
integral then value of integration is 0.
So, y = 0