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Let f(x) be a funtion defined by f(x)=(...

Let `f(x)` be a funtion defined by `f(x)=(ab-a^(2)-2)x-int_(0)^(x)(cos^(4)t+sin^(2)t-2)dt` If `f(x)` is a decreasing function for all `x` in R and for all `a` in R where `a` is independent of `x` then `b` belongs to

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