Question

СРОЧНО МАТЕМАТИКА ЕГЭ ПРИМЕР 25Б

Answer 1

$2 \sqrt{2} \times \frac{1 + \cos( \frac{3\pi}{4} ) }{2} - \sqrt{2} =$

$\sqrt{2} \times (1 - \frac{ \sqrt{2} }{2} ) - \sqrt{2} =$

$\sqrt{2} - 1 - \sqrt{2} = - 1$