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Math Help - Exact Value

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    Exclamation Exact Value

    find the exact value of the cos(105). (in degrees)
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    Quote Originally Posted by jumpman23 View Post
    find the exact value of the cos(105). (in degrees)
    \cos105^\circ=\cos\left(60+45\right)^\circ

    Use the sum and difference formula.
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    thanks
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