DLMF:4.42.E2 (Q1990)

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DLMF:4.42.E2
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    Statements

    test
    cos ⁡ A = b c = 1 sec ⁡ A , 𝐴 𝑏 𝑐 1 𝐴 {\displaystyle{\displaystyle\cos A=\frac{b}{c}=\frac{1}{\sec A},}}
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    DLMF id
    DLMF:4.42.E2
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