The interval of a for which the equation...

The interval of `a` for which the equation `t a n^2x-(a-4)tanx+4-2a=0` has at least one solution `AAx in [0,pi//4]` `a in (2,3)` b. `a in [2,3]` c. `a in (1,4)` d. `a in [1,4]`

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