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Secant (1/cos)
R={ y | yER; y>=1 or y<=-1}
D={ x | xER; x=/= π/2 + πn, nEZ }
cosecant (1/sin)
R={ y | yER; y>=1 or y<=-1}
D={ x | xER; x=/= πn, nEZ}
tangent (sin/cos)
R= { y | yER}
D={ x | xER; x=/= π/2+ πn, nEZ }
same domain as secant
cotangent (cos/sin)
R= { y | yER}
D={ x | xER; x=/= πn, nEZ}
same domain as cosecant