If the acute angles between the pairs of lines 3x2−7xy+4y2=0 and 6x2−5xy+y2=0 be θ1 and θ2 respectively, then
None of these
tanθ=2√h2−aba+b Obviously θ1=tan−1(2√494−123+4)=tan−1(17)θ2=tan−1(2√254−66+1)=tan−1(17)