Prove tan(x) + cot(x) = sec(x) csc(x)

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Prove tan(x) + cot(x) = sec(x) csc(x)
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Hey just not understanding how you got sin ² x. I know we had to find the denominator but how you got that? Can explain please. The video is helpful but that part is just bothering me.

devinawilliams