COSθ-SINθ=√2COS(θ+π/4) 0
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COSθ-SINθ=√2COS(θ+π/4)0COSθ-SINθ=√2COS(θ+π/4)0COSθ-SINθ=√2COS(θ+π/4)0√2COS(θ+π/4)=√2(COSθcos45-sinθs
COSθ-SINθ=√2COS(θ+π/4) 0
COSθ-SINθ=√2COS(θ+π/4) 0
COSθ-SINθ=√2COS(θ+π/4) 0
√2COS(θ+π/4)=√2(COSθcos45-sinθsin45)=√2(COSθ*√2/2-sinθ*√2/2)=COSθ-SINθ
θ∈(0,π/2),比较cosθ、sin(cosθ)、cos(sinθ)的大小
COSθ-SINθ=√2COS(θ+π/4) 0
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