Re: [微分] 應用題

看板trans_math作者matmoki (戶田最高)時間17年前 (2008/11/30 22:26)推噓1(1推 0噓 2→)

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※ 引述《victor7935 (victor)》之銘言： : The base of an isoceles triangle is 6 feet. : Given that the altitude is 4 feet and increasing : at the rate of 2 inches per minute,at what rate is the : vetex angle changing ? : 不大懂題目的意思... : 幫忙一下囉! Thanks! 高L 一半底邊S 1 feet = 12 inch ...... tan(θ/2)=S/L θ=arctan(S/L)*2 -S(dL/dt) -----2---- L dθ/dt = -------2----*2 = -6*2/(25*12) = -0.04 1 + S --2- L -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 122.117.188.214

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