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Trigonometric equation

solve([tan(x) + tan(2x) - tan(3x) == 0], x, to_poly_solve='force') Getting empty list in output. How to solve this?

Trigonometric equation

The following code

sage: solve([tan(x) + tan(2x) tan(2*x) - tan(3x) tan(3*x) == 0], x, to_poly_solve='force')
Getting 

outputs an empty list in output. list. How to solve this?

Trigonometric equation

The following code

sage: solve([tan(x) + tan(2*x) - tan(3*x) == 0], x, to_poly_solve='force')

outputs an empty list. How to solve this?