Simplify exactly:

 sin⁡(42∘)cos⁡(303∘)+cos⁡(42∘)sin⁡(303∘)=sin⁡(\displaystyle {\sin{{\left({42}^{\circ}\right)}}}{\cos{{\left({303}^{\circ}\right)}}}+{\cos{{\left({42}^{\circ}\right)}}}{\sin{{\left({303}^{\circ}\right)}}}={\sin{{(}}})=\displaystyle {)}=  

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