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Mathematics
Problem
Given that
sin
42
∘
=
0.6691
\sin 42^{\circ}=0.6691
sin
4
2
∘
=
0.6691
(correct to four decimal places), find
cos
48
∘
\cos 48^{\circ}
cos
4
8
∘
correct to four decimal places. a)
0.7431
0.7431
0.7431
b)
0.6947
0.6947
0.6947
c)
0.6691
0.6691
0.6691
d)
0.7071
0.7071
0.7071
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