TEXT{COSEC}\theta =2\]\[\Rightarrow \]\[{{\sin }^{2}}\theta +1=2\sin \theta \] \[\Rightarrow \]\[{{\sin }^{2}}\theta -2\sin \theta +1=0\] \[\Rightarrow \]\[{{(\sin \theta -1)}^{2}}=0\Rightarrow \sin \theta =1\] REQUIRED value of \[{{\sin }^{10}}\theta +\text{cose}{{\text{c}}^{10}}\theta ={{(1)}^{10}}+\frac{1}{{{(1)}^{10}}}=2\].