Question

Calcule a expressão E= Sen15° - Cos75°

Answer 1

$\large\boxed{\begin{array}{l}\underline{\rm cosseno~de~\hat angulos~complementares}\\\sf cos(90^\circ-\alpha)=sen(\alpha)\\\sf cos(90^\circ-75^\circ)=sen(15^\circ)\\\sf E=sen(15^\circ)-cos(75^\circ)\\\sf E=sen(15^\circ)-sen(15^\circ)\\\sf E=0\end{array}}$