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

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If 10 sec^(2)x - 9tan^(2)x= 13 and 0^@le x lt 90^@ then x = _____

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 : 9sec^2A-9tan^2A= a. 1 b. 9 c. 8 d. 0

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

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