Using find

(i) 1


(ii)


(iii)


(iv)

(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


=



9