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If the acute angle between the lines `ax^(2) + 2hxy + by^(2) = 0` is `60^(@)`, then show that `(a+3b)(3a+b) = 4h^(2)`.

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If the acute angle between the lines `ax^(2) + 2hxy + by^(2) = 0` is `60^(@)`, then show that `(a+3b)(3a+b) = 4h^(2)`.
A. `h^(2)`
B. `2h^(2)`
C. `3h^(2)`
D. `4h^(2)`
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Correct Answer - D
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