` 9 sec ^ 2 A - 9 tan ^ 2 A = ? `

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

Choose the correct option. Justify your choice : 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

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

Prove the following identities : (sec A - tan A)/ (sec A + tan A) = 1 - 2 sec A tan A + 2 tan^(2) A

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

Prove that in an acute triangle ABC,the least values of Sigma sec A and Sigma tan^(2)A are 6 and 9 respectively.

In a triangle ABC, tanA + tanB + tanC = 9. If tan^2 A+ tan^2 B + tan^2 C= k then the least value of k^(9/7) is

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