ATan is not available in a Math Expression

Using a Math Expression node, atan will generate an error as an unknown expression.

Reproduced in Main Promotable-CL-2471062

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1. Open QAGame Editor
2. Create a New BP
3. In the Even Graph, add a Math Expression node
4. Add 'atan(1)' to the Expression node

RESULTS: Error is generated

EXPECTED: Results pin appears and expression compiles

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