noelleA noelleA
  • 08-06-2017
  • Mathematics
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mreijepatmat
mreijepatmat mreijepatmat
  • 11-06-2017
sin² Ф + cos² Ф =1, if sin Ф = 11/61, that means cos² Ф =(11/61)² 

(11/61)² + cos² Ф = 1;   cos² Ф = 1 - (11/61)²

cos² Ф = 3600 / 3721 and cos Ф =√(3600/3721) = 60/61, so cos Ф =60/61
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