证明cosx+1/(cosx)^2-2>0,x(0,π/2)

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证明cosx+1/(cosx)^2-2>0,x(0,π/2)

证明cosx+1/(cosx)^2-2>0,x(0,π/2)
证明cosx+1/(cosx)^2-2>0,x(0,π/2)

证明cosx+1/(cosx)^2-2>0,x(0,π/2)
F(u)=u+1/u^2
F'(u)=1-2/u^3=(u^3-2)/u^3
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