$$\frac { 1 } { 2 } ( - \frac { 7 } { 2 } ) + \cos ( \frac { 3 \pi } { 2 } ) - \frac { 1 } { 2 } \sin ( - \pi ) =$$
$-\frac{7}{4}=-1.75$
$$-\frac{7}{4}+\cos(\frac{3\pi }{2})-\frac{1}{2}\sin(-\pi )$$
$$-\frac{7}{4}+0-\frac{1}{2}\sin(-\pi )$$
$$-\frac{7}{4}-\frac{1}{2}\sin(-\pi )$$
$$-\frac{7}{4}-\frac{1}{2}\left(-1\right)\sin(\pi )$$
$$-\frac{7}{4}-\frac{1}{2}\times 0$$
$$-\frac{7}{4}+0$$
$$-\frac{7}{4}$$
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$-\frac{7}{4} = -1\frac{3}{4} = -1.75$
