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Approximate value of an inverse trigonometric function

This type of question, asked 2 times: 4 May 2023 S2, 13 May 2026 S2. All 2 questions below, oldest first.

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  1. Question 1

    4 May 2023 S2

    107
    The approximate value of tan⁡−1(0.999)\tan^{-1}(0.999) is (use π=3.1415\pi=3.1415)

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  2. Question 2

    13 May 2026 S2

    77
    The approximate value of sin⁡−1(0.51)\sin^{-1}(0.51) is ....... [Given π=3.1416\pi = 3.1416, 23=1.1547\dfrac{2}{\sqrt{3}} = 1.1547]

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