Reciprocal Identities

  $\displaystyle \sin x=\frac{1}{\csc x}$   $\displaystyle \sec x=\frac{1}{\cos x}$   $\displaystyle \tan x=\frac{1}{\cot x}$      
  $\displaystyle \csc x=\frac{1}{\sin x}$   $\displaystyle \cos x=\frac{1}{\sec x}$   $\displaystyle \cot x=\frac{1}{\tan x}$      




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