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    Trigonometric values without a calculator

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    Find value without calculator
    sin (arccos1/4)

    © BrainMass Inc. brainmass.com March 6, 2023, 1:17 pm ad1c9bdddf

    Solution Preview

    First consider a right angle triangle ABC, right angled at B.
    AB is the perpendicular, BC base and CA is the hypotenuse.
    Let angle ACB = x

    Now, ...

    Solution Summary

    The solution shows how to find a trigonometric value without a calculator.