Plaaasss Hu Use the first five terms of the trigonometric series to approximate the value of sin 14pi/18 to four decimal places. Then compare the approximation to the actual value.

a.
–0.9609, –0.9659
b.
–0.9568, –0.9659
c.
–0.9649, –0.9659
d.
0.6432, 0.6428