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BITSAT2009MathematicsTrigonometric EquationsActual

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

Options

  1. A( y 3 )
  2. B( y )
  3. C(2 y )
  4. D( 3 2 y )

Correct answer

B. ( y )

Step-by-step solution

( aligned & 1- + 1+ & = 1- + 1+ 1+ + 1+ + & = (1+ )^2- ^2 (1+ )(1+ + ) & = 2 (1+ ) (1+ )(1+ + ) & = 2 1+ + =y aligned )

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