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[" 17.(i) If "vec a=5hat i-hat j-3hat k"...

[" 17.(i) If "vec a=5hat i-hat j-3hat k" and "vec b=hat i+3hat j-5hat k" ,then "],[" show that the vectors "(vec a+vec b)" and "(vec a-vec b)" are "],[" perpendicular."]

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