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Three of the following tricks are used to solve trigonometry equations, but one is not. Can you find the one that is NOT used?

Sometimes we turn single angles into double and half angles to solve trigonometry equations.

Sometimes factoring is used to solve trigonometry equations.

Sometimes radicals are removed and like terms are combined to solve trigonometry equations.

Sometimes fractions are cleared in order to solve trigonometry equations.

Respuesta :

I don't remember ever factoring to solve a trig problem
so I would go with B as the one not used