If θ=−13π3\displaystyle \theta=-\frac{{{13}\pi}}{{3}}, then

sin⁡(θ)\displaystyle {\sin{{\left(\theta\right)}}} =  

cos⁡(θ)\displaystyle {\cos{{\left(\theta\right)}}} =  

Give exact values using fractions and/or radicals, but not decimals.

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