What is the product of the perpendiculars from the two points -Maths 9th

What is the product of the perpendiculars from the two points -Maths 9th
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(a) a2 Given, ax cos ϕ + by sin ϕ – ab = 0. ∴ Perpendicular distance of the given line from \(\big(+\sqrt{b^2-a^2},0\big)\)d1 = \(\bigg|rac{a\sqrt{b^2-a^2}\, ext{cos}\,\phi\,-ab}{\sqrt{a^2\, ext{cos}^2\,\phi\,+b^2\, ext{sin}^2\,\phi}}\bigg|\)∴ Perpendicular distance of the given line from \(\big(-\sqrt{b^2-a^2},0\big)\)
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