# $$\tan{x}$$ = ?

Level 2

What of the following expressions is equivalent to $$\tan x$$?

As a hint, let me remind you of the double angle formulas:
$$\sin{\left(2x\right)} = 2\sin{x}\cos{x}$$
$$\cos{\left(2x\right)} = \cos^2{x}-\sin^2{x}$$

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