化简(sina+cosa-1)(sina-cosa+1)/sin2a如题.

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化简(sina+cosa-1)(sina-cosa+1)/sin2a如题.

化简(sina+cosa-1)(sina-cosa+1)/sin2a如题.
化简(sina+cosa-1)(sina-cosa+1)/sin2a
如题.

化简(sina+cosa-1)(sina-cosa+1)/sin2a如题.
(sina+cosa-1)(sina-cosa+1)/sin2a
=(2sina/2cosa/2-2sin^2 a/2)(2sina/2cosa/2+2sin^2a/2)/4sina/2cosa/2cosa
=sina/2*(cosa/2-sina/2)(cosa/2+sina/2)/cosa/2cosa
=sina/2*(cos^2a/2-sin^2a/2) / cosa/2cosa
=sina/2cosa / cosa/2cosa
=tana/2

sina+cosa-1)(sina-cosa+1)/sin2a
=((sina)^2-(cosa-1)^2)/sin2a
=((sina)^2-1-(cosa)^2+2cosa)/sin2a
=(-2(cosa)^2+2cosa)/sin2a
=(-2(cosa)^2+2cosa)/2sinacosa
=(1-cosa)/sina

(sina+cosa-1)(sina-cosa+1)/sin2a
=[sina^2-(cosa-1)^2]/sin2a
=[sina^2-cosa^2+2cosa-1]/sin2a
=[-2cosa^2+2cosa]/sin2a
=[-2cosa^2+2cosa]/(2sina*cosa)
=[-cosa+1]/sina
=tan(a/2)

(sina+cosa-1)(sina-cosa+1)/sin2a
=((sina)^2-(cosa-1)^2)/sin2a
=((sina)^2-1-(cosa)^2+2cosa)/sin2a
=(-2(cosa)^2+2cosa)/sin2a
=(-2(cosa)^2+2cosa)/2sinacosa
=(1-cosa)/sina

网络真好!