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Pythagorean Identity
sin²theta+cos²theta=1
tan²theta+1=
sec²theta
1+cottheta=
csc²theta
sin theta =
cos(90-theta)
cos theta
sin(90-theta)
tan theta =
cot(90-theta)
cot theta =
tan(90-theta)
sec theta
csc(90-theta)
csc theta=
sec(90-theta)