(sinx+cosx)^2+cos2x-1化简?
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原式=sin^2x+2sinxcosx+cos^2x+cos2x-1
=sin2x+1+cos2x-1
=sin2x+cos2x
=√2*sin(2x+π/4)
=sin2x+1+cos2x-1
=sin2x+cos2x
=√2*sin(2x+π/4)
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(sinx+cosx)²+cos2x-1
=(sin²x+cos²x+2sinxcosx)+cos2x-1
=(1+2sinxcosx)+cos2x-1
=1+sin2x+cos2x-1
=sin2x+cos2x
=(sin²x+cos²x+2sinxcosx)+cos2x-1
=(1+2sinxcosx)+cos2x-1
=1+sin2x+cos2x-1
=sin2x+cos2x
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解:(sinx+cosx)^2+cos(2x)-1
=(sinx)^2+(cosx)^2+2cosxsinx+[1-2(sinx)^2]-1
=(cosx)^2-(sinx)^2+sin(2x)
=cos(2x)+sin(2x)
=√2[cos(2x)sin(丌/4)+sin(2x)cos(丌/4)]
=√2sin(2x+丌/4)
=(sinx)^2+(cosx)^2+2cosxsinx+[1-2(sinx)^2]-1
=(cosx)^2-(sinx)^2+sin(2x)
=cos(2x)+sin(2x)
=√2[cos(2x)sin(丌/4)+sin(2x)cos(丌/4)]
=√2sin(2x+丌/4)
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(sinx+cosx)^2+cos2x-1
=1+sin2x +cos2x-1
=sin2x +cos2x
=√2.sin(2x+π/4)
=1+sin2x +cos2x-1
=sin2x +cos2x
=√2.sin(2x+π/4)
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