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AP EAMCET202018 Sep 2020Morning ShiftMathematicsPair of LinesActual

The angle between the straight lines (x^2+4 x y+y^2=0 ) is.......

Options

  1. A(30^ )
  2. B(45^ )
  3. C(60^ )
  4. D(90^ )

Correct answer

C. (60^ )

Step-by-step solution

Let the angle (( ) ) between the straight lines (x^2+4 x y+y^2=0 ) Then, ( = 2 (2)^2-1 1+1 = 2 h^2-a b (a+b) ) (= 2 3 2 = 3 =60^ )

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