Hello,
For [-2pi, 2pi] find all solutions of the trigonometric equation 2sin2 - tan = 0.
If you have some number in the form 4ABC = 0, this will be true:
- if the first term, A, equals zero;
- if the second term, B, equals zero; OR
- if the third term, C, equals zero.
So above, at least one of your zeros will be at the place the first term, , equals zero. The rest follow similar logic.