[微積] 微分, 極座標面積

看板Math作者 (迅雷不及掩耳盜鈴)時間13年前 (2013/02/08 19:07), 編輯推噓0(000)
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嗯, 事實上是書上答案和我算出來不太一樣, 還請版友們幫忙看一下是答案寫錯還是我寫錯… (1) Find the derivatives of the following functions f( θ) = sin( θ) where θis measured in degrees. 我的答案是 ( π/ 180 ) sin( πθ/ 180 ) 書上給 cos θ... (2) Sketch the curve r( θ) = 2 - sin( θ) and find the area that it encloses in the polar coordinate system. 我算 ( 9π/ 2 ) 書上給 ( 9π/ 4 ) 附上書上解答: 2π A_1 = (1/2) ∫ ( r^2 ) dθ= ( 9π/ 8 ) + 2 3π/ 2 π/ 2 A_2 = (1/2) ∫ ( r^2 ) dθ= ( 9π/ 8 ) - 2 0 Then A_total = A_1 + A_2 = ( 9π/ 4 ) ※ 編輯: BaBi 來自: 36.234.220.163 (02/08 19:32)
文章代碼(AID): #1H5DnbC5 (Math)
文章代碼(AID): #1H5DnbC5 (Math)