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sin period
2pi
cos period
2pi
tan period
pi
csc period
2pi
sec period
2pi
cot period
pi
sec VA
1/2(pi/b) + k(pi/b)
csc VA
0 + k(pi/b)
tan VA
1/2(pi/b) + k(pi/b)
cot VA
0 + k(pi/b)
pythag theorem identity 1
sin²x+cos²x = 1
pythag theorem 2
1 + tan²x = sec²x
pythag theorem 3
1 + cot²x = csc²x
sin sum/diff identity
sin(a +- b)= (sina)(cosb) +- cosa(sinb)
plus = plus
minus = minus
cos sum/diff identity
cos(a +- b)= cosa(cosb) -+ sina(sinb)
plus= minus
minus=plus
sin double angle identity
sin(2x)= 2sinxcosx
cos double angle identity
cos(2x)=
cos²x-sin²x
1-2sin²x
2cos²x-1