geometry - Proving Sin Cos Tan - Mathematics Stack Exchange

I am asked to prove the following: $$\dfrac{1-\cos x}{\sin x}=\dfrac{\sin x}{1+\cos x}=\tan\dfrac x2.$$ Looking at the answer I am not able to see what is going on here: $$\frac{1 - \cos(x)}{\s

geometry - Proof of each of these identities - Mathematics Stack Exchange

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