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Introduction of Trigonometry — Maths STD 10 — Question

CBSE BoardEnglish MediumSTD 10MathsIntroduction of Trigonometry1 Mark
MCQ
9 sec2 A – 9 tan2 A =
  • A
    1
  • ✓
    9
  • C
    8
  • 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.

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