The range of values of a for which th...

The range of values of a for which the function `f(x)={-x^3+cos^(-1)a ,\ 0lt=x<1x ,\ \ \ \ 1lt=xlt=3` has the smallest value at `x=1,` is `[cos2,\ 1]` (b) `[-1,cos2]` `[0,\ 1]` (d) `[-1,\ 1]`

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