1 + cot²x = cosec²x (1 + cot²x = cosec²x)

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1 + cot²x = cosec²x

What each symbol means

Symbol	What it stands for
x	Angle where sin x ≠ 0 (x ≠ multiple of π)

x ≠ nπ. Derived by dividing sin²x+cos²x=1 by sin²x.