化简(sin2x/sinx-cosx-sinx)+(cosx/tan2x-1)-sinx怎么算?
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化简(sin2x/sinx-cosx-sinx)+(cosx/tan2x-1)-sinx怎么算?
化简(sin2x/sinx-cosx-sinx)+(cosx/tan2x-1)-sinx怎么算?
化简(sin2x/sinx-cosx-sinx)+(cosx/tan2x-1)-sinx怎么算?
(sin2x/sinx-cosx)-(sinx+cosx/tan2x-1)-sinx
=[sin2x*(sinx+cosx)]/[(sinx-cosx)(sinx+cosx)]-(sinx+cosx)/[(sin2x/cos2x)-1]-sinx
=[sin2x*(sinx+cosx)]/(sin2x-cos2x)-[cos2x(sinx+cosx)]/(sin2x-cos2x)-sinx
=[(sinx+cosx)(sin2x-cos2x)]/(sin2x-cos2x)-sinx
=sinx+cosx-sinx
=cosx