MCQ
9 sec2 A – 9 tan2 A =
- A1
- ✓9
- C8
- D$0$
✓
Answer
Correct option: B.
9
(b) 9
$\begin{array}{l} 9 \sec ^2 A-9 \tan ^2 A \\
=9\left(\sec ^2 A-\tan ^2 A\right) \\
=9(1) \ldots\left[\text { As } \sec ^2 A-\tan ^2 A=1\right] \\
=9\end{array}$
Hence, alternative 9 is correct.
$\begin{array}{l} 9 \sec ^2 A-9 \tan ^2 A \\
=9\left(\sec ^2 A-\tan ^2 A\right) \\
=9(1) \ldots\left[\text { As } \sec ^2 A-\tan ^2 A=1\right] \\
=9\end{array}$
Hence, alternative 9 is correct.
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