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利用換底公式可得 log以8為底2的對數=1/3 所以cosα=1/3 有因為α屬於(0,π/2), sinα=根號[1-(cosα)^2]=2√2/3 tan(π-α)=-tanα=-sinα/cosα=[-2√2/3]/(1/3)=-2√2
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