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 ≃ x {\displaystyle \sin x\simeq x}
cos x ≃ 1 − x 2 2 {\displaystyle \cos x\simeq 1-{\frac {x^{2}}{2}}}
tan x ≃ x {\displaystyle \tan x\simeq x}
