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" (i) "9sec^(2)A-9tan^(2)A" Is equal : "...

" (i) "9sec^(2)A-9tan^(2)A" Is equal : "

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Choose the correct option.Justify your choice (i) 9sec^(2)A-9tan^(2)A

Choose the correct option. Justify your choice. (i) 9sec^2A-9tan^2A= (a) 1 (b) 9 (c) 8 (d) 0

Choose the correct option. Justify your choice. (i) 9sec^2A-9tan^2A= (a) 1 (b) 9 (c) 8 (d) 0