:Һ

ʽ:acos(a)

˵:aΪ(ʱԾÿԪ),ҲΪ(ʱԱ)

:

y = [ 0.594129477438577    0.161888389457897
      0.551473044115805    0.0408036774214374
      0.00724859163502631  0.659116786745897  ]

acos(y)//س
ans =
 [ 0.934613353448525   1.40819234092484
   0.986667285580079   1.52998131826881
   1.56354767168236    0.851152593546176  ]