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9sec^2A-9tan^2A is equal to (a) 1 (b) 9 ...

`9sec^2A-9tan^2A` is equal to (a) 1 (b) 9 (c) 8 (d) 0

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9sec^2A-9tan^2 A is equal to

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

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

9 sec^(2) A - 9 tan^(2) A =