If the angle between the lines whose direction ratios are (2,−1,2) and (x,3,5) is \pi/4 , then the smaller value of x is [NDA II 2017]

NDA Math Three Dimensional Geometry

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If the angle between the lines whose direction ratios are (2,−1,2) and (x,3,5) is

, then the smaller value of x is

[NDA II 2017]

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