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解sinθ-cosθ=1/2兩邊平方得:(sinθ-cosθ)²;=1/4即1-2sinθcosθ=1/4∴2sinθcosθ=3/4∴sinθcosθ=3/8tanθ+cotθ=(sinθ/cosθ)+(cosθ/sinθ)=(sin²;θ+cos²;θ)/(sinθcosθ)=1/(3/8)=8/3…
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