Mathematics

Question

Please help me

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.

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