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The system of equations tanx=acotx ,tan2...

The system of equations `tanx=acotx ,tan2x=bcosy` (a)cannot have a solution if `a=0` (b)cannot have a solution if `a=1` (c)cannot have a solution if `2sqrt(a)>|b(1-a)|` (d)has a solution for all `aa n db`

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