JEE Main2005MathematicsInverse Trigonometric FunctionsActual
If ⁻¹ x- ⁻¹ y 2 = , then 4 x^2-4 x y +y^2 is equal to
Options
- A2 2
- B4
- C4 ^2
- D-4 ^2
Correct answer
C. 4 ^2
Step-by-step solution
aligned & ⁻¹ x- ⁻¹ y 2 = & ⁻¹ ( x y 2 + (-x^2 ) (1- y^2 4 ) )= & ⁻¹ ( x y+ 4-y^2-4 x^2+x^2 y^2 2 )= & 4-y^2-4 x^2+x^2 y^2=4 ^2 +x^2 y^2-4 x y & 4 x^2+y^2-4 x y =4 ^2 aligned