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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