Sin4次方θ+cos4次方θ=1
Sin4次方θ+cos4次方θ+2Sin2次方θcos2次方θ-2Sin2次方θcos2次方θ=1
(Sin2次方θ+cos2次方θ)2次方-2Sin2次方θcos2次方θ=1
1-2Sin2次方θcos2次方θ=1
2Sin2次方θcos2次方θ=1
4Sin2次方θcos2次方θ=1
(2Sinθcosθ)2次方=1
2Sinθcosθ=1
(sinθ-cosθ)2次方=1-2Sinθcosθ=1-1=0
sinθ-cosθ=0对的！1-2Sin2次方θcos2次方θ=12Sin2次方θcos2次方θ=04Sin2次方θcos2次方θ=0(2Sinθcosθ)2次方=02Sinθcosθ=0(sinθ-cosθ)2次方=1-2Sinθcosθ=1-0=1sinθ-cosθ=1或-1
sin4次方θ+cos4次方θ=1,sinθ-cosθ=
sin4次方θ+cos4次方θ=1,sinθ-cosθ=
数学人气：636 ℃时间：2019-10-17 03:29:44
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