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tan2x
sec2x-1
sec2x
tan2x+1
1 (sec and tan)
sec2x-tan2x
csc2x
1+cot2x
cot2x
csc2x-1
1 (csc and cot)
csc2x-cot2x
cos(2x)
cos2x-sin2x
cos(2x) (cos)
2cos2x-1
cos(2x) (sin)
1-2sin2x
sin(2x)
2sinxcosx