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If theta is the measure of acute angle ...

If `theta` is the measure of acute angle between the pair of line repseented by `ax^(2) + 2hxy + by^(2) = 0` , then prove that
`tan theta = |(2sqrt(h^(2) - ab))/(a+b)|,a + b ne 0 `
Hence find the acture angle between the lines `x^(2) - 4xy + y^(2) = 0`

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