Q13 of 23 Page 2

Prove the following results:

[CBSE 2012]

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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