Prove the following results:
Let 
and 
⇒ 
and 
where 
Now, LHS is reduced to : sin(x+y)
⇒ 
..eq(i)..
As 
⇒ 
where 
⇒ 
⇒ 
Similarly,
where 
⇒ 
Putting these values in eq(i)
⇒ 
⇒ 
= RHS
2
Prove the following results:
Let and
⇒ and
where
Now, LHS is reduced to : sin(x+y)
⇒ ..eq(i)..
As
⇒ where
⇒
⇒
Similarly,
where
⇒
Putting these values in eq(i)
⇒
⇒
= RHS