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Trigonometric Ratios — Maths STD 10 — Question

CBSE BoardEnglish MediumSTD 10MathsTrigonometric Ratios1 Mark
MCQ
Which of the following is not defined?
  • A
    $\cos 0^{\circ}$
  • B
    $\tan 45^{\circ}$
  • ✓
    $\sec 90^{\circ}$
  • D
    $\sin 90^{\circ}$
✓

Answer

Correct option: C.
$\sec 90^{\circ}$
(C) $\sec 90^{\circ}$
By using definitions of various trigonometric ratios, we find that $\sec 90^{\circ}$ is undefined.
AUTER $\sec 90^{\circ}=\frac{1}{\cos 90^{\circ}}=\frac{1}{0}$, which is undefined.

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