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Let : f(x)={(a+3cosx)/(x^2),x<0btan(pi/(...

Let : `f(x)={(a+3cosx)/(x^2),x<0btan(pi/([x+3])),xgeq0` If `f(x)` is continuous at `x=0,` then find `aa n db` , where `[dot]` denotes the greatest integer function.

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