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When is (\cos^{-1}x=\frac{\pi}{2}-\sin^{-1}x) true?

Answer and explanation

Correct answer: When (x\in[-1,1])

The governing complementary-angle identity is sin⁻¹x + cos⁻¹x = π/2. Rearranging gives cos⁻¹x = π/2 − sin⁻¹x. Both inverse functions must have real values, and the real domain of each is −1 ≤ x ≤ 1. Thus the identity is true precisely for x ∈ [−1, 1], making option A correct. The endpoints are included because sin⁻¹(±1) and cos⁻¹(±1) are defined. Option B is too broad: inverse sine and inverse cosine are not real for every real x. Options C and D lie outside the real domain and therefore cannot satisfy the stated real-valued identity.

Related tags

Inverse-TrigonometryComplementary-IdentityDomainProperties Of Inverse Trigonometric FunctionsInverse Trigonometric FunctionsMathematicsClass 12 Mcq

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