Answer :
Let 
and 
⇒ 
and 
where 
Now, LHS is reduced to : cos(x+y)
⇒ 
..eq(i)
As 
where 
⇒ 
⇒ 
⇒ 
Also, 
where 
⇒ 
⇒ 
⇒ 
⇒ 
⇒ 
where 
⇒ 
⇒ 
Putting the values in eq(i),
⇒ 
⇒ 
= RHS
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