( ) 1 0, 0462 21, 6  COS = 15,3 =2COS 1   A A A2  A2 A S5 R D /    

2.( ) 1 0, 0462 21, 6

 

cos = 15,3 =2cos 1

   

A A A

2

  

A

2

 

a s5 r d /    