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  # trig
  
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  Given sin t= 1/5, sec t<0, find cos (t) and cot (t)
  
  Jul 10, 2020
  
  #1
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  If sec < 0 then    cos < 0         (sec is 1/cos)
  
  sin^2 + cos^2 = 1
  
  cos^2 = 1-sin^2
  
  = 1 - 1/25 =24/25
  
  cos t =   sqrt 24  / 5                                 cot = cos / sin    I think you can do that one ...
  
  Jul 10, 2020