If the angle between the lines whose direction ratios are \(\left\langle {2, - 1,\;2} \right\rangle \) and \(\left\langle {x,\;3,\;5\;} \right\rangle\) is \(\frac{\pi }{4}\), then the smaller value of x is

If the angle between the lines whose direction ratios are \(\left\lan

1.	If the angle between the lines whose direction ratios are \(\left\langle {2, - 1,\;2} \right\rangle \) and \(\left\langle {x,\;3,\;5\;} \right\rangle\) is \(\frac{\pi }{4}\), then the smaller value of x is
A.	52
B.	4
C.	2
D.	1
Answer» C. 2

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If the angle between the lines whose direction ratios are \(\left\langle {2, - 1,\;2} \right\rangle \) and \(\left\langle {x,\;3,\;5\;} \right\rangle\) is \(\frac{\pi }{4}\), then the smaller value of x is

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