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sin(a+b)
sin(a)cos(b)+cos(a)sin(b)
sin(a-b)
sin(a)cos(b)-cos(a)sin(b)
cos(a+b)
cos(a)cos(b)-sin(a)sin(b)
cos(a-b)
cos(a)cos(b)+sin(a)sin(b)
sin2x
1-cos2x
cos2x
1-sin2x
1
csc2-cot2x
sec2x-tan2x
csc2x
1+cot2x
sec2x
1+tan2x
cot2x
csc2x-1
tan2x
sec2x-1