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sin(x+y)
sin(x)cos(y) + cos(x)sin(y)
cos(x+y)
cos(x)cos(y)-sin(x)sin(y)
tan(x+y)
tan(x) + tan(y)/1 - tan(x)tan(y)
sin(2x)
2sin(x)cos(x)
tan(2x)
2tan(x)/1 - tan²x
cos(2x)
1 - 2sin²x
sin²x
1 - cos(2x)/2
cos²x
1 + cos(2x)/2
sin(x/2)
square root(1 - cosx/2)
cos(x/2)
square root(1 + cosx/2)
