Maths-
General
Easy
Question
If θ is angle between pair of lines
, then 
- 10
- 20
- 5
- 15
Hint:
First find the coefficient of y square and then obtain the angle between the pair of straight lines.
The correct answer is: 10
Given That:
If θ is angle between pair of lines
, then 
>>> We first need to find the value of 
>>> Since, it is a pair of straight lines. Then, the determinant should be equal to zero.
>>>
>>> This gives
= 2.
>>> Therefore, now the angle between the pair of straight lines becomes:
tan
= 
tan
= 
>> We know that

>>> Therefore,
= 10.
>>>> Therefore, the value of
is 10.
>>> = 2.
>>> tan =
>>> = 10.
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