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What is the horizontal limiting value of tan⁻¹x when x is very large and negative?

Answer and explanation

Correct answer: −π/2

The principal range of tan⁻¹x is (−π/2, π/2). As x becomes increasingly negative, the angle in this range whose tangent equals x approaches the lower endpoint −π/2. In limit notation, lim x→−∞ tan⁻¹x = −π/2. Thus option A is correct. The value is approached from above; it is a horizontal asymptotic value rather than a value attained at a finite input. Option B is the corresponding limit when x→+∞, so its sign is wrong here. Option C would describe behavior near x = 0, not at negative infinity, and option D lies outside the principal range of arctangent. The sign and the direction of infinity are both essential in identifying the correct limit.

Related tags

Inverse-Trigonometric-FunctionsHorizontal-AsymptoteLimitsIntroduction To Inverse Trigonometric FunctionsInverse Trigonometric FunctionsMathematicsClass 12 Mcq

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