If $Sin \theta $ = $\frac{20}{29}$, then what is the value of $Cos \theta $?

If $Sin \theta $ = $\frac{20}{29}$, then what is the value of $Cos \theta $?
1). $\frac{29}{21}$
2). $\frac{21}{29}$
3). $\frac{21}{20}$
4). $\frac{20}{29}$

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