Inverse Trigonometric Functions Questions with Solutions

21 questions4 easy13 medium4 hard

Inverse trigonometric functions, such as sin^-1 x, cos^-1 x and tan^-1 x, return the angle whose trigonometric ratio is a given value. Because trigonometric functions repeat, each inverse is defined only on a principal value branch. For example, sin^-1 x takes values between -pi/2 and pi/2. This topic covers domains and principal value ranges, finding principal values, and key properties such as sin^-1 x + cos^-1 x = pi/2 and the formulas for tan^-1 x + tan^-1 y. Exam questions test simplifying expressions, solving equations, and evaluating compositions such as sin(cos^-1 x). The most common mistake is ignoring the principal range, for example assuming sin^-1(sin x) always equals x. Practise the inverse trigonometric functions questions below, each with a step-by-step solution.

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Q21.
The value of $s in^{- 1} \frac{1}{2} + s in^{- 1} \frac{2 - 1}{6} + s in^{- 1} \frac{3 - 2}{12} + \dots$ to infinity is equal to
A. $π$ B. $\frac{π}{3}$ C. $\frac{π}{2}$ D. $\frac{π}{4}$
hardAsked in NIMCET 2015View solution ›

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