Question

1+sqrt 2 sin a помогите

Answer 1

$1+\sqrt2\, sina=\sqrt2\cdot (\frac{1}{\sqrt2}+sina)=\sqrt2\cdot (sin\frac{\pi }{4}+sina)=\\\\=\sqrt2\cdot 2\, sin(\frac{\pi }{8}+\frac{a}{2})\cdot cos(\frac{\pi}{8}-\frac{a}{2})$