If the d.r.'s of two lines are (x, 3, 5) and (2, -1, 2) and if the angle between those lines is `45^(@)`, then the value of x is

If the d.r's of two lines are (x,3,5) and (2,-1,2) and if the anlgle between those lines is 45^(@) , then x =

If the d.r.'s of two lines are (1, -1, 0) and (1, -2, 1) then the angle between them is

If the d.r.'s of two lines are (1,0,0) and (0,1,0) then the angle between those two lines is,

If the d.R.s of two lines are 1,-2,-2 and 2,-2,1 , then the measures of the acute angle between them is

If (2,-1,2) and (K,3,5) are the triads of direction ratios of two lines and the angle between them is 45^(@) , then the value of K is

If (theta) is an acute angle between the lines y=2x+3,y=x+1 then the value of tan theta=

The angle between the lines x = 2 and y = 3 is .....

If an angle between the lines ax^(2)-7xy+3y^(2)+3x+y-2=0 is 45^(@) then a=

The diection ratios of two lines are proportional to (2,3,-6) and (3,-4,5), then the acute angle between them is