So, the way I like to think about it - let's think about the volume if I were to just take the bottom function - if I were to just take f(x) - if I were to just take f(x) - and if I were to rotate that function around y=x - if I were to rotate this thing around - sorry, around y=1 - what would the volume of that be, and then I'm going to subtract from that the volume if I were to take the top function - if
แล้ว, วิธีที่ผมชอบคิดคือว่า -- ลองคิดถึง ปริมาตรหากผมเอาฟังก์ชันข้างล่าง -- ถ้าผม เอาแค่ f(x) -- ถ้าผมใช้แค่ f(x) -- และถ้าผม