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The correct option is (D) ..........................eq (i) The above equation can be written as; We know that  therefore,
The correct option is (D)
The correct option is (C) .......................(i) we can write his above equation as; = 2
The correct option is (B) = 9 .............(i) and it is known that  Therefore, equation (i) becomes,
We know that  Therefore,
....................(i) The above equation can be written as;   (Since )
We know that the identity
We know that  (i) (ii) We know the identity of  (iii)
This equation can be written as; .................(i) We know that   Therefore, equation (i) becomes; = 0 So, the answer is 0.
We have, , Here 4A is an acute angle According to question, We know that
By using the identity of  and  We know that,   and  the above equation can be written as;
Given that, A, B and C are interior angles of   To prove -  Now, In triangle ,         A + B + C  =  Hence proved
As we know, the value of  ,
We have, and we know that  therefore,  A = 90 - B  A + B = 90 Hence proved.
We have,   2A  =  (A - )  we know that,
Taking Left Hand Side (LHS) = = = [it is known that  and  ] = 0
Taking Left Hand Side (LHS) =       [it is known that  and   Hence proved.
The above equation can be written as ; ....................(i) It is known that  Therefore, equation (i) becomes, So, the answer is 0.
The above equation can be written as ; .........(i) It is known that,  Therefore, equation (i) becomes, So, answer is 1.
We can write the above equation as;  By using the identity of   Therefore,  So, the answer is 1.
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