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For which values of x is cosec x not defined?

Answer and explanation

Correct answer: x = nπ

The governing concept is the domain restriction of a reciprocal trigonometric function. Since cosec x = 1/sin x, it is undefined whenever the denominator sin x equals zero. The sine function is zero at 0, π, 2π, 3π and all corresponding negative multiples, which is written compactly as x = nπ, where n is any integer. Hence option B is correct. At x = π/2 + nπ, sin x is either 1 or −1, so cosec x is defined. The forms in options C and D do not represent all zeros of sine. The integer condition for n is essential because it describes the complete repeating set.

Related tags

Trigonometric-FunctionsDomainCosecantAnglesTrigonometric FunctionsMathematicsClass 12 Mcq

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