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JEE Main202431 Jan 2024Morning ShiftMathematicsInverse Trigonometric FunctionsActual

For α , β , γ ≠ 0 . If sin − 1 α + sin − 1 β + sin − 1 γ = π and α + β + γ α − γ + β = 3 α β , then γ equal to

Options

  1. A3 2
  2. B1 2
  3. C3 - 1 2 2
  4. D3

Correct answer

A. 3 2

Step-by-step solution

Given: sin − 1 α + sin − 1 β + sin − 1 γ = π Let, sin − 1 α = A , sin − 1 β = B , sin − 1 γ = C ⇒ A + B + C = π Also, α = sin A , β = sin B , γ = sin C . . . i It is given that, α + β 2 − γ 2 = 3 α β . ⇒ α 2 + β 2 − γ 2 = α β ⇒ sin 2 A + sin 2 B - sin 2 C = sin A sin B ⇒ sin 2 A + sin B + C sin B - C = sin A sin B ⇒ sin 2 A + sin π - A sin B - C = sin A sin B ⇒ sin 2 A + sin A sin B - C = sin A sin B ⇒ sin A sin A + sin B - C = sin A sin B ⇒ sin A sin A + sin B - C - sin A sin B = 0 ⇒ sin A sin A + sin B - C - sin

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