Q.
The angle between the pair of lines whose equation is 4x2+10xy+my2+5x+10y=0 is
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a
tan−1(3/8)
b
tan−1(3/4)
c
tan−1{225−4m/(m+4)}, m∈R
d
None of these
answer is B.
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Detailed Solution
Being a pair of lines, abc+2fgh−af2−bg2−ch2=0.This gives m=4, now, find the angles between the lines
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