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**Cosine Definition as an Infinite Series**

### Cosine Definition as an Infinite Series

**Latex Code**:

**MathML Code**:

$\mathrm{cos}x=\sum _{n=0}^{\infty}\backslash frac{(-1)}^{n}{x}^{2n}\left(2n\right)!$ |

**MathType 5.0**: