BITSAT2009MathematicsTrigonometric EquationsActual
If (y= 2 1+ + ), then value of ( 1- + 1+ ) is
Options
- A( y 3 )
- B( y )
- C(2 y )
- 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 )