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Multiply and simplify: (cscx + 1)(cscx - 1)

This is for my trig class. Thanks for the help!

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Parviz F. | Mathematics professor at Community CollegesMathematics professor at Community Colle...
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( CSC X + 1 ) ( CSC -1) =
 
  CSC^2 X  -1  =
 
  1 + Cot^2 X - 1 =
 
      Cot^2 X