Choose the correct option. Justify yo...

Choose the correct option. Justify your choice. (i) `9sec^2A-9tan^2A=` (a) 1 (b) 9 (c) 8 (d) 0 (ii) `(1+tantheta+sectheta)(1+cottheta-"c o s e c\ "theta)=` `(a)\ \ 0\ \ \ (b)\ \ \ 1(c)\ 2\ \ \ \ \ \ \ \ \ \ \ \ \ \ (d)\ 1` (iii) `(secA+tanA)(1-s

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