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Which of the following is not defined for $x = 90^\circ$ ?
- (a)$\cot x$
- (b)$\operatorname{cosec} x$
- (c)$\tan \frac{x}{2}$
- (d)$\sec x$
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Ans. (D) $\sec x$
Which of the following is not defined for x = 90° ?
CBSE Class 10 Maths PYQ · Trigonometry · Specific Angles Expression · 1 Mark · March 2026 · Basic
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