Q. If and , then

 2047  242 BITSATBITSAT 2013 Report Error

Solution:

... (i)
and ... (ii)
Equation (i) may be written as



... (iii)
Putting the value of from (iii) in (ii),
we get
... (iv)
Squaring (iii) and (iv) and adding,
we get

... (iv)
Squaring (iii) and (iv) and adding, we get