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Trigonometry/ Please Help

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Find two exact values of sin(cosˉ¹√5/6)

  • Trigonometry/ Please Help -

    cos^-1 (√5/6)
    is an angle Ø so that sinØ = √5/6
    sketch a right-angled triangle with hypotenuse 6, and opposite side √5
    by Pythagoras the adjacent side is √31

    then cosØ = √31/6

    so sin(cosˉ¹√5/6) = √31/6

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