求证(sinθ+cosθ-1)(sinθ-cosθ+1)/sin2θ=tanθ/2
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求证(sinθ+cosθ-1)(sinθ-cosθ+1)/sin2θ=tanθ/2
求证(sinθ+cosθ-1)(sinθ-cosθ+1)/sin2θ=tanθ/2
求证(sinθ+cosθ-1)(sinθ-cosθ+1)/sin2θ=tanθ/2
原式=(sinθ2-(cosθ-1)2)/sin2θ
=(2cosθ-2cosθ2)/sin2θ
=(1-cosθ)/sinθ
= ( 2cos(θ/2) )2/sinθ
=tan(θ/2)
【1】(sinx+cosx-1)(sinx-cosx+1)=[sinx+(cosx-1)][sinx-(cosx-1)]=sin²x-(cosx-1)²=sin²x-cos²x+2cosx-1=2cosx-2cos²x=2cosx(1-cosx)=(2sinxcosx)[(1-cosx)/sinx]=sin(2x)tan(x/2).∴(sinx+cosx-1)(sinx-cosx+1)/sin2x=tan(x/2)
求证sinθ/(1+cosθ)+(1+cosθ)/sinθ=2/sinθ
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化简:1+sinθ+cosθ+2sinθcosθ /1+sinθ+cosθ
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求证[tanθ·(1-sinθ)]/1+cosθ=[cotθ·(1-cosθ)]/1+sinθ
求证(sinθ+cosθ-1)(sinθ-cosθ+1)/sin2θ=tanθ/2
求证 (sinθ+cosθ-1)(sinθ-cosθ+1)) /sin2θ=tanθ/2
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