Expand Using Sum/Difference Formulas sin((17pi)/28)cos(pi/7)+cos((17pi)/28)sin(pi/7)

$\sin (\frac{17 π}{28}) \cos (\frac{π}{7}) + \cos (\frac{17 π}{28}) \sin (\frac{π}{7})$

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$\sin (\frac{17 π}{28}) \cos (\frac{π}{7}) + \cos (\frac{17 π}{28}) \sin (\frac{π}{7})$