Answer :

Given: sin 𝛳 =

We know that, sin2 θ +cos2 θ =1

sin2 A = 1-cos2 A

sin A = √ (1-cos2 A

So, cos 𝛳 = √(1-a2/b2 ) = √((b2-a2)/b2 ) = √(b2-a2 )/b

Hence, the answer is √(b2 - a2 )/b

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