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sin(s+t)
sin(s)cos(t)+cos(s)sin(t)
sin(s-t)
sin(s)cos(t)-cos(s)sin(t)
cos(s+t)
cos(s)cos(t) - sin(s)sin(t)
cos(s-t)
cos(s)cos(t) + sin(s)sin(t)
tan(s+t)
(tans+tant)/(1-tanstant)
tan(s-t)
tans-tant/1+tanstant
sin2θ
2sinθcosθ
cos2θ
cos²θ - sin²θ = 1 - 2sin²θ = 2cos²θ - 1
tan2θ
2tanθ/1-tan²θ
sin^2x
1 - cos2x / 2
cos^2x
1 + cos2x / 2
tan^2x
1 - cos 2x / 1 + cos2x
sinθ/2
±√1 - cosθ/2
cosθ/2
±√1 + cosθ/2
tanθ/2
1 - cosθ / sinθ = sinθ / 1 + cosθ