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

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Sin cos tan proving identities help! I just need help with questions 4 5 6 7! Can anyone help me. Im not sure how to start ive tried each one and keep

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Prove that the points, represented by complex numbers ` (5+8i),(13+20i),(19+29i)` are collinear.