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Jasper Deng (talk | contribs) →Astronomy: probably the most notable application Tags: Mobile edit Mobile web edit Advanced mobile edit |
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and the above approximation follows when {{math|tan ''X''}} is replaced by {{mvar|X}}.
For example, the [[parsec]] is defined by the value of D when {{math|''d''=1 AU, ''X''=1 arcsec}}, but the definition used is the small-angle approximation (the first equation above).
=== Motion of a pendulum ===
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