\[\boxed{\mathbf{958.}}\]
\[1)\sin\left( - \frac{\pi}{2} \right) + \cos\frac{\pi}{2} =\]
\[= \sin\left( \frac{3\pi}{2} - 2\pi \right) + 0 =\]
\[= \sin\frac{3\pi}{2} = - 1\]
\[2)\sin 0 - \cos{2\pi} = 0 - 1 = - 1\]
\[3)\sin\pi + \sin{1,5\pi} = 0 +\]
\[+ \sin\frac{15\pi}{10} = \sin\frac{3\pi}{2} = - 1\]
\[4)\sin 0 + \cos{2\pi} = 0 + 1 = 1\]