Question

$9 \: {sec}^{2} \: a \: - \: 9 {tan}^{2} \: a \: = \: \: \: \: \: \: \:$

answer me fastly

Also give explanation

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Answer 1

Answer:

first correct your problem....there is 9 multiplied with tan^2 @ also...

1 + tan^2@ = sec^2@

=> 1 = sec^2@ - tan^2@

on multiplying both sides by 9

9 = 9 sec^2@ - 9 tan^2 @

Thus answer will be 9