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• sen² x + cos² x = 1 sen² x = 1 - cos² x cos² x - (1 - cos² x)= 17 cos² x - sen² x = 17 cos (2x) = 17 espero ter ajudado!!!

  in Dados: sen2(x) + cos2 (x) = 1? Comment by adrian-carter_60ad00ff758ec May 2021