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Questions  

The angle between the pair of lines 5x2+4xy5y2=0 is

a
π2
b
π3
c
π
d
π4

detailed solution

Correct option is A

The condition that two lines represented by the equation ax2+2hxy+by2=0 are to be perpendicular is  a+b=0For the equation 5x2+4xy−5y2=0 , the values a=5,b=−5Since, a+b=0, the angle between the lines is π2

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