Question

Помогите решить, пожалуйста!!!!

Answer 1

$\displaystyle\bf\\1)\\\\=Sin\Big(\alpha +\frac{\pi }{6}+\alpha -\frac{\pi }{6} \Big)=Sin2\alpha \\\\\\2)\\\\=Cos\Big(\frac{\pi }{4} +\beta +\frac{\pi }{4}-\beta \Big)=Cos\frac{2\pi }{4}=Cos\frac{\pi }{2} = 0$