If $Cot\theta$ =$\frac{21}{20}$, then what is the value of $Cosec\theta $?

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

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