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प्रश्न
Choose correct alternatives:
If acute angle between lines ax2 + 2hxy + by2 = 0 is, `pi/4`, then 4h2 = ______.
विकल्प
a2 + 4ab + b2
a2 + 6ab + b2
(a + 2b)(a + 3b)
(a – 2b)(2a + b)
उत्तर
If acute angle between lines ax2 + 2hxy + by2 = 0 is, `pi/4`, then 4h2 = `bb(underline(a^2 + 6ab + b^2)`.
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