IB Mathematics Analysis and Approaches Quiz
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GEOMETRY AND TRIGONOMETRY
Question 1
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If
cos
(
2
x
)
=
7
25
\cos(2x) = \frac{7}{25}
cos
(
2
x
)
=
25
7
, and
x
x
x
is an acute angle, what is the value of
cos
x
\cos x
cos
x
?
A
3
5
\frac{3}{5}
5
3
B
±
4
5
\pm \frac{4}{5}
±
5
4
C
16
25
\frac{16}{25}
25
16
D
4
5
\frac{4}{5}
5
4
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