Question

1+sqrt 2 sin a помогите

Answer 1

$1+sqrt2, sina=sqrt2cdot (frac{1}{sqrt2}+sina)=sqrt2cdot (sinfrac{pi }{4}+sina)=\\=sqrt2cdot 2, sin(frac{pi }{8}+frac{a}{2})cdot cos(frac{pi}{8}-frac{a}{2})$