Small-angle approximation: Difference between revisions

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Astronomy: probably the most notable application
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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, {{math|''X''}}=1 arcsec}}arcsecond, but the definition used is the small-angle approximation (the first equation above).
 
=== Motion of a pendulum ===