Add some math methods #654

Job	Run time
rust_ci (ubuntu-latest, stable)	51s
rust_ci (windows-latest, stable)	1m 58s
rust_ci (macos-latest, beta)	1m 7s
rust_ci (macos-latest, stable)	53s
rust_ci (ubuntu-latest, beta)	59s
rust_ci (windows-latest, beta)	1m 59s
	7m 47s

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