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Let f(x)={cos[x],xgeq0|x|+a ,x<0 The f...

Let `f(x)={cos[x],xgeq0|x|+a ,x<0` The find the value of `a ,` so that `("lim")_(x->0)` `f(x)` exists, where `[x]` denotes the greatest integer function less than or equal to `x` .

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