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csc θ
1 / sin θ
sec θ
1 / cos θ
cot θ
1 / tan θ
tan θ
sin θ / cos θ
cot θ
cos θ / sin θ
sin2θ + cos2θ = 1
1 + tan2θ = sec2θ
cot2θ + 1 = csc2θ
what are the pythag identities?