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Line 115: and the above approximation follows when {{math\|tan ''X''}} is replaced by {{mvar\|X}}. For example, the [[parsec]] is defined by the value of Dd when {{~~math~~mvar\|~~''d''~~D}}=1 AU, {{~~math~~mvar\|''X''}}=1 arcsecond, but the definition used is the small-angle approximation (the first equation above). === Motion of a pendulum ===

Small-angle approximation: Difference between revisions