Nandy was asked to evaluate cos 19
12
so she showed the following
work:
Line 1: cos (195) = cos(+3)
(6)
Line 2: cos
57
4
+ cos
Line 3:
1
+
2
2
Line 4: -V2+1
Nandy made a mistake in her work above.
a.) What line did the mistake occur? Justify your answer. (5 points)
b.) What is the correct answer? Leave answers as exact values. WORK
DOES NOT NEED TO BE SHOWN. (5 points)