Plz help me find the volume of the region

Question

Hello, who knows how to solve this problem?

Find the volume of the region bounded above by the surface  =   

and below by the rectangle  = { ≤  ≤ /;  ≤  ≤ /}

Answer 1

V = ∫₀^/ ∫₀^/∫₀ ² dz dy dx

   =2∫₀^/ sinx dx ∫₀^/ cosy dy

   = 2(0-1)(-√2/2 + 0)

   = √2