Smaa angle approximation

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Smaw angle approximation is a wey o estimatin angles in radians, whaur the angle is smaw (less nor 3 or 4 degree).

Whan x is smaw, an in radians, the follaein formulae is true:

\sin x \simeq x

\cos x \simeq 1 - \frac{x^2}{2}

\tan x \simeq x