DLMF:4.20.E8 (Q1696)

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DLMF:4.20.E8
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    d n d z n cos z = cos ( z + 1 2 n π ) . derivative 𝑧 𝑛 𝑧 𝑧 1 2 𝑛 𝜋 {\displaystyle{\displaystyle\frac{{\mathrm{d}}^{n}}{{\mathrm{d}z}^{n}}\cos z=% \cos\left(z+\tfrac{1}{2}n\pi\right).}}
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