1) 1-2sinXcosX/cos^2X-sin^2X=1-tanX/1+tanX
1) 1-2sinXcosX/cos^2X-sin^2X=1-tanX/1+tanX
2) tan^2X-sin^2X=tan^2X·sin^2X
3) (cosX-1)^2+sin^2X=2-2cosX
4) sin^4X+cos^4X=1-2sin^2Xcos^2X
2) tan^2X-sin^2X=tan^2X·sin^2X
3) (cosX-1)^2+sin^2X=2-2cosX
4) sin^4X+cos^4X=1-2sin^2Xcos^2X
数学人气：509 ℃时间：2020-06-11 00:46:26
优质解答
1、是(1-2sinxcosx)/(cos^2x-sin2^x)=(1-tanx)/(1+tanx)吧!左分子(1-2sinxcosx)=(cos^x-sin^x)^2 左分母(cos^2x-sin2^x)=(cos^x-sin^x)(cos^x+sin^x) 则左=(cos^x-sin^x)/(cos^x+sin^x) 右边切割化弦也得(cos^x-sin^...
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