" Let "f:R rarr R" satisfy relation "f(x...

`" Let "f:R rarr R" satisfy relation "f(x)f(y)-f(xy)=x+y AA x,y in R" and "f(1)>0" .If "h(x)=f(x)f^(-1)(x)" ,then length of longest interval in which "h(sin x+cos x)" is strictly decreasing is."`

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