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Let f be the function f(x)=cosx-(1-(x^2)...

Let `f` be the function `f(x)=cosx-(1-(x^2)/2)dot` Then `f(x)` is an increasing function in `(0,oo)` `f(x)` is a decreasing function in `(-oo,oo)` `f(x)` is an increasing function in `(-oo,oo)` `f(x)` is a decreasing function in `(-oo,0)`

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