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  • Summary of trigonometric identities - Clark University
    Summary of trigonometric identities You have seen quite a few trigonometric identities in the past few pages It is convenient to have a summary of them for reference These identities mostly refer to one angle denoted θ, but there are some that involve two angles, and for those, the two angles are denoted α and β The more important identities
  • Reciprocal trig ratios (article) - Khan Academy
    Learn how cosecant, secant, and cotangent are the reciprocals of the basic trig ratios: sine, cosine, and tangent


















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