The acute angle between the lines represented by \(x^2-4xy+y^2=0\) is
A. 90°
B. 60°
C. 30°
D. 45°
1 answer
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Answer: B. 60°
\(\tan\theta=\left|\frac{2\sqrt{h^2-ab}}{a+b}\right|=\frac{2\sqrt{4-1}}{2}=\sqrt3\Rightarrow\theta=60^\circ\).
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· 23 Oct 2026
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