DLMF:4.21.E13 (Q1715)

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DLMF:4.21.E13
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    Statements

    test
    sec 2 ⁡ z = 1 + tan 2 ⁡ z , 2 𝑧 1 2 𝑧 {\displaystyle{\displaystyle{\sec^{2}}z=1+{\tan^{2}}z,}}
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    DLMF id
    DLMF:4.21.E13
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