# Well, that's freaky!

**Calculus**Level 4

Compute \[ \large\displaystyle\sum_{r=1}^{\infty} \frac{2^{2r-1}(-1)^r}{(2r)!}. \]

Give your answer to 3 decimal places.

Compute \[ \large\displaystyle\sum_{r=1}^{\infty} \frac{2^{2r-1}(-1)^r}{(2r)!}. \]

Give your answer to 3 decimal places.

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