[CBSE 2013]Answer :
Given:- 
Let 
Therefore,
⇒
⇒
Now, by Pythagoras theorem
⇒
⇒
⇒
As given, and putting assume value, we get
=
We know that: Formula
=
=
=
=
; by rationalisation
= 
= 
Hence
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Prove the following:
OR
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Solve the following equation for x :
