求证:[(sinx+cosx-1)(sinx-cosx+1)]/sin2x=(1-cosx)/sinx
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求证:[(sinx+cosx-1)(sinx-cosx+1)]/sin2x=(1-cosx)/sinx
[(sinx+cosx-1)(sinx-cosx+1)]/sin2x
=[sinx+(cosx-1)][sinx-(cosx-1)]/sin2x
=[(sinx)^2-(cosx-1)^2]/sin2x
=[(sinx)^2-(cosx)^2+2cosx-1]/sin2x
=[(sinx)^2-(cosx)^2+2cosx-1]/sin2x
=-[-(sinx)^2+(cosx)^2-2cosx+1]/sin2x
=-[1-(sinx)^2+(cosx)^2-2cosx]/sin2x
=-[(cosx)^2+(cosx)^2-2cosx]/sin2x
=-[2(cosx)^2-2cosx]/2sinxcosx
=-2cosx[cosx-1]/2sinxcosx
=-[cosx-1]/sinx
=(1-cosx)/sinx
=[sinx+(cosx-1)][sinx-(cosx-1)]/sin2x
=[(sinx)^2-(cosx-1)^2]/sin2x
=[(sinx)^2-(cosx)^2+2cosx-1]/sin2x
=[(sinx)^2-(cosx)^2+2cosx-1]/sin2x
=-[-(sinx)^2+(cosx)^2-2cosx+1]/sin2x
=-[1-(sinx)^2+(cosx)^2-2cosx]/sin2x
=-[(cosx)^2+(cosx)^2-2cosx]/sin2x
=-[2(cosx)^2-2cosx]/2sinxcosx
=-2cosx[cosx-1]/2sinxcosx
=-[cosx-1]/sinx
=(1-cosx)/sinx
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