<Dd> sin ⁡ w ′ − sin ⁡ w (\ displaystyle \ \ sin w' - \ sin w) </Dd> <P> could be approximately expressed as </P> <Dl> <Dd> (w ′ − w) cos ⁡ w (\ displaystyle \ (w' - w) \ cos w) </Dd> </Dl> <Dd> (w ′ − w) cos ⁡ w (\ displaystyle \ (w' - w) \ cos w) </Dd>

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