Expand Using Sum/Difference Formulas sin((43pi)/42)cos((6pi)/7)-cos((43pi)/42)sin((6pi)/7)

$\sin (\frac{43 π}{42}) \cos (\frac{6 π}{7}) - \cos (\frac{43 π}{42}) \sin (\frac{6 π}{7})$

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$\sin (\frac{43 π}{42}) \cos (\frac{6 π}{7}) - \cos (\frac{43 π}{42}) \sin (\frac{6 π}{7})$