Ask Me Help Desk - I am trying to find the exact value of an expression

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Find the exact value of the expression

Cos(sin-1 1/4)

I am assuming you mean $cos(sin^{-1}(1/2))$

If so, take note that $cos(sin^{-1}(x))=\sqrt{1-x^{2}}$

Sin^-1(√3/2)

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