Show that a =9i +j -6k and b =4i -6k +5k are at right angles to each other.
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Step-by-step explanation:
cosx=a•b/|a||b|
a•b=(9i+j-6k)•(4i-6k+5k)
a•b=36-6-30=0
cosx=0
x=90
these are right angle at each other
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