(sinx+cosx)^2+2cos^2x-2怎么能变到1+sin2x+1+cos2x-2要详细的过程~!
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(sinx+cosx)^2+2cos^2x-2怎么能变到1+sin2x+1+cos2x-2要详细的过程~!
(sinx+cosx)^2+2cos^2x-2怎么能变到1+sin2x+1+cos2x-2
要详细的过程~!
(sinx+cosx)^2+2cos^2x-2怎么能变到1+sin2x+1+cos2x-2要详细的过程~!
(sinx+cosx)^2+2cos^2x-2
=(sin²x+cos²x+2sinxcosx)+(2cos²x-1)-1
=1+sin2x+cos2x-1
=1+sin2x+1+cos2x-2
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