AP EAMCET2002MathematicsPair of Lines
If the angle 2 is acute, then the acute angle between the pair of straight lines aligned & x^2( - )+2 x y & +y^2( + )=0, is aligned
Options
- A2
- B2
- C3
Correct answer
3
Step-by-step solution
We have x^2( - )+2 x y We know that, aligned & = 2 h^2-a b a+b & = 2 ^2 -( - )( + ) ( + )+( - ) & = 2 ^2 - ^2 + ^2 2 = & = aligned