Question

СРОЧНО МАТЕМАТИКА ЕГЭ ПРИМЕР 25Б

Answer 1

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

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

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