\[1)\cos x = |x|\]
\[y = \cos{x;}\ y = |x|.\]
\[Ответ:\ \approx - 0,7;\ \approx 0,7.\]
\[2)\sin x = - |x + 1|\]
\[y = \sin{x;}\ y = - |x + 1|.\]
\[Ответ:\ \approx - 1,9;\ \approx - 0,5.\]