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:
sinx≃x{\displaystyle \sin x\simeq x}
cosx≃1−x22{\displaystyle \cos x\simeq 1-{\frac {x^{2}}{2}}}
tanx≃x{\displaystyle \tan x\simeq x}