DLMF:4.21.E27 (Q1729)

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DLMF:4.21.E27
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    Statements

    test
    sin ⁡ ( 2 ⁢ z ) = 2 ⁢ sin ⁡ z ⁢ cos ⁡ z = 2 ⁢ tan ⁡ z 1 + tan 2 ⁡ z , 2 𝑧 2 𝑧 𝑧 2 𝑧 1 2 𝑧 {\displaystyle{\displaystyle\sin\left(2z\right)=2\sin z\cos z=\frac{2\tan z}{1% +{\tan^{2}}z},}}
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    DLMF id
    DLMF:4.21.E27
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