Question

the angle between two vectors A=3i^-4j^+5k^ and B=9i^+3j^+9k^ is?​

Please Explain It !!

Answer 1

Answer:

answer |A|=√50. |B|=√171

A.B= 27-12+45=>60

also cos#=A.B/|A||B|

cos#=60/√8550

#=cos^-1√8550/60