Use the first five terms of the trigonometric series to approximate the value of
%5Cpi%20%7D%7B2%7D" id="TexFormula1" title="sin\frac{\pi }{2}" alt="sin\frac{\pi }{2}" align="absmiddle" class="latex-formula"> to four decimal places. a. 0.9878
b. 1.2345
c. 0.6578
d. 1.0000
