alleryStart learning →Find tan θ for the acute angle between the pair x² - 6xy + 5y² + 10x - 14y + 9 = 0.
A4/3
B1/2
C3/2
D2/3
Answer & Solution
Correct answer: D. 2/3
tan θ = 2√(h² - ab)/(a + b) = 2√(9 - 5)/6 = 4/6 = 2/3.
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