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BITSAT2021MathematicsTrigonometric EquationsActual

If y= 2 1+ + , then value of 1- + 1+ is

Options

  1. Ay 3
  2. By
  3. C2 y
  4. D3 2 y

Correct answer

B. y

Step-by-step solution

1- + 1+ = 1- + 1+ 1+ + 1+ + = (1+ )²- ² (1+ )(1+ + ) = (1+ ² +2 )- (1- ² ) (1+ )(1+ + ) = 2 1+ + =y

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