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$\frac{ \sqrt{1+\sin(x)}+\sqrt{1+\cos(x)} }{ \sqrt{1-\sin(x)}+\sqrt{1-\cos(x)} }=\sqrt2+1\,\forall x\in [0,\pi/2]$ the fraction of square roots may be simplified using double angle formulas.. though i wouldn't recommend showing the derivative to be 0...

clathratus
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