is-the-following-trigonometric-equation-an-identitycot2xcot2x12cotxcotleft2xrigh

Question

Is the following trigonometric equation an identity?

$\cot (2 x) = \frac{\cot^{2} x - 1}{2 \cot x}$

Accepted Answer

An identity

Answer

Not an identity

Is the following trigonometric equation an identity?cot(2x)=cot2x−12cotx\cot\left(2x\right)=\frac{\cot^2x-1}{2\cot x}