1.

Let f(x) be a function such that f'(x)=log_(1//3)[log_(3)(sinx+a)]. If f(x) is decreasing for all real values of x , then

Answer»

`a in (1,4)`
`a in(4,OO)`
`a in(2,3)`
`a in (2,oo)`

ANSWER :B


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