Find all solutions in the interval [0, 2π).

7 tan3x - 21 tan x = 0

Hence, all the solutions in the interval [0,2π) are:

We are asked to find the solution of the trignometric identity which is given by:

On dividing both side by 7 we get:

i.e.

Either

i.e.

or

If

and if

Hence, all solutions are:

you did not give any options thus this is the best answer i can give to you with this little information you have given

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