Answer :

(i) Using Identity



In the given expression


On substituting these values in the above identity, we get


=



(ii) Using Identity



In the given expression


On substituting these values in the above identity, we get


=



(iii) Using Identity



In the given expression


On substituting these values in the above identity, we get


=



(iv) Using Identity



In the given expression


On substituting these values in the above identity, we get


=



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