1.

Let f(x) be a function defined by f(x) =(ab -a^2-2)x -underset(0)overset(x)(cos^4 t + sin^2t-2)dtIf (x) is a decreasing function for all x in Randa in R where a is independent of x, then

Answer»

`be in (1,OO)`
`b in(-1,1)`
`b in (-oo,]`
non of these

Solution :We have
`f(X)=(ab-a^2-2)x-underset


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