Pregunta: sinucos4u−cosusin4u cos5u sin5u cos−3u sin−3u

Given that,

$\sin \left(\mathrm{u}\right)\cos \left(4\mathrm{u}\right)$ - $\cos \left(\mathrm{u}\right)\sin \left(4\mathrm{u}\right).$

We can simplify the above expression using the subtraction identity of sine.