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If the acute angle between the lines ax^...

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

`30^(@)`

B

`45^(@)`

C

`60^(@)`

D

`"tan"^(-1)1/2`

Text Solution

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The correct Answer is:
C
NA
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TARGET PUBLICATION-PAIR OF STRAIGHT LINES-CRITICAL THINKING
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