设tan(θ/2)=t,求证:sinθ=2t/(1+t^2),cosθ=(1-t^2)/(1+t^2),tanθ=2t/(11t^2)设tan(θ/2)=t,求证:sinθ=2t/(1+t^2),cosθ=(1-t^2)/(1+t^2),tanθ=2t/(1-t^2)
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![设tan(θ/2)=t,求证:sinθ=2t/(1+t^2),cosθ=(1-t^2)/(1+t^2),tanθ=2t/(11t^2)设tan(θ/2)=t,求证:sinθ=2t/(1+t^2),cosθ=(1-t^2)/(1+t^2),tanθ=2t/(1-t^2)](/uploads/image/z/8981471-47-1.jpg?t=%E8%AE%BEtan%28%CE%B8%2F2%29%3Dt%2C%E6%B1%82%E8%AF%81%EF%BC%9Asin%CE%B8%3D2t%2F%281%2Bt%5E2%29%2Ccos%CE%B8%3D%281-t%5E2%29%2F%281%2Bt%5E2%29%2Ctan%CE%B8%3D2t%2F%2811t%5E2%29%E8%AE%BEtan%28%CE%B8%2F2%29%3Dt%2C%E6%B1%82%E8%AF%81%EF%BC%9Asin%CE%B8%3D2t%2F%281%2Bt%5E2%29%2Ccos%CE%B8%3D%281-t%5E2%29%2F%281%2Bt%5E2%29%2Ctan%CE%B8%3D2t%2F%281-t%5E2%29)
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