(1) (i) 1 = SS₁₂ =S₁₁²S √1-x² /√√2 1-sin = 2. (x² + y) dxdy = S₁ S²(x² + y) dydx x² dydx = 2√1=¹ dx = 2√2 + √-3 dr x²√1-x² √1-x² dx -1 3 27 1/250 S 1 sin²20 do= dx = cos 0 do. I = 2√2 sin²0 cos² 0 dº √2 CR¹²1. √2/²1-cos 40 2 (cos³0+ sin 6) dvdo 2-2 √2 0 12" 1 + cos20 do = √2 T 8 2 8 2 i) x=r cos 0, y = r sin 0/√2 < ≥, J=r/√2. = [(*cos² 0 + √2 sin e) drdo0 √√2 2 π/2 0 de= = ₁/² cos³ 0 do = 4 CT/2 5 8 15 = [cos 0+32 sin ede= √2²" (cos² 0 + sin) de 4 3√2 4 3√2 π/2 r=rcoso, y = r sin0 とおくと, J = r. S₂√x dxdy = 25" S √2 8 3/2 cos1/20 drdo T y cos 10