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1.y=e^x的導數為y=e^x. 2.所以過(x0,y0)的切線為y=e^x0(x-x0)+e^x. 3.因為過原點(0,0),所以0=e^x0*(-x0)+e^x,x0=1. 4.故切線為y=ex.
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