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Show that vec A = hat I - 5 hat j and ...

Show that ` vec A = hat I - 5 hat j ` and ` vec B= 2 hat I - 10 hat j` are parallel to each other.

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` Cos theta = ( vec A. vec b)/ (AB)`
` =(( hat i-5hat j).( 2 hat hat i- 10 aht j))/( sqrt ( 1_^2 + ( -5)^2) ( sqrt 2^2+ ( - 10 )^2))`
` ( 2+ 50) /( sqrt 26 sqrt 105 ) = ( 52)/( 52) = 1 or ` theta =0^@`.
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