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Sin (a + b) =
Sin(a) Cos(b) + Sin(b) Cos(a)

Sin (a – b) =
Sin(a) Cos(b) Sin(b) Cos(a)

Cos (a + b)=
Cos(a) Cos(b) – Sin(a) Sin(b)

Cos(a – b)
Cos(a) Cos(b) + Sin(a) Sin(b)

tan(a + b)
 tan(a) + tan(b)
 1− tan(a) tan(b)

tan(a  b)
 tan(a) + tan(b)
 1− tan(a) tan(b)





cos2u =
cos^{2}u − sin^{2}u

sin ( ^{θ}/_{2 })=
= ± squrt((1− cosθ)/2)

cos( ^{θ}/_{2} )=
= ± squrt((1− cosθ)/2)










Area of a sector of a circle with angle α
A _{S}= αr ^{2}/ 2

Angular velocity
ω = α / time

Linear velocity
ν = s/t = αr/t = rω

