1.

Let f (x) (cos ^(2) x)/(1+ cos +cos ^(2)x )and g (x) lamda tan x+1(1-lamda) sin x-x,where lamda in R and x in [0, pi//2]. The exhaustive seet of values of 'lamda' such that g '(x) ge 0 for any x in [0, pi//2):

Answer»

`[1,OO)`
`[0,oo)`
`[(1)/(2), oo)`
`[(1)/(3), oo)`

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