If α and β be the solutions of acosθ+bsinθ=c, then-
A
sinα+sinβ=2bca2+b2
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B
sinαsinβ=c2−a2a2+b2
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C
sinα+sinβ=2acb2+c2
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D
sinα.sinβ=a2−b2b2+c2
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Solution
The correct options are Bsinαsinβ=c2−a2a2+b2 Csinα+sinβ=2bca2+b2
acosθ=c−bsinθ square both sides ⇒a2(1−sin2θ)=c2+b2sin2θ−2bcsinθ ⇒(a2+b2)sin2θ−2bcsinθ+(c2+a2)=0 ⇒sinα+sinβ=2bca2+b2,sinα.sinβ=c2−a2a2+b2
option A and B