Answer each of the following questions in one word or one sentence or as per exact requirement of the question:
Write the value of 
.
Given tan-1 {tan (15π/4)}
= tan-1 {tan (4π - π/4)}
We know that tan (2π – θ) = -tan θ
= tan-1 (-tan π/4)
= tan-1 (-1)
= -π/4
∴ tan-1 {tan (15π/4)} = -π/4
1