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sinx =
1/cscx
cosx =
1/secx
(trig reciprocal) tanx =
1/cotx
cscx =
1/sinx
secx =
1/cosx
cotx =
1/tanx
(not over cot) tanx =
sinx/cosx
(not over tan) cotx =
cosx/sinx
sin2x =
2sinxcosx
cos2x =
cos²x - sin²x, 2cos²x-1, 1-2sin²x
sin(a+b) =
sinacosb+cosasinb
sin(a-b) =
sinacosb - cosasinb
cos(a+b) =
cosasinb + sinacosb
cos(a-b) =
cosasinb - sinacosb
1 =
cos²x+sin²x
(identity) sec²x =
1+tan²x
(identity) csc²x =
cot²x+1