помогите
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1) AB^2=16+3*16=4*16
AB=8
cosB=4/8=1/2
2) cosA=AC/AB
AC^2=64-15*4=4
AC=2
cosA=2/8=1/4
3)cosA=AC/AB=16/sqrt(16^2+144)=16/20=0,8
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Verified answer
1) AB^2=16+3*16=4*16
AB=8
cosB=4/8=1/2
2) cosA=AC/AB
AC^2=64-15*4=4
AC=2
cosA=2/8=1/4
3)cosA=AC/AB=16/sqrt(16^2+144)=16/20=0,8