4.    Choose the correct option. Justify your choice.

     (i) 9\sec^{2}A-9\tan^{2}A=

    (A) 1    (B) 9    (C) 8    (D) 0

Answers (1)
M manish

The correct option is (B) = 9

9\sec^2A-9 \tan ^2A = 9(\sec^2A- \tan ^2A).............(i)

and it is known that \sec^2\theta -\tan^2\thea = 1
Therefore, equation (i) becomes, 9\times 1 = 9
 

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