IB Mathematics Analysis and Approaches Quiz
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GEOMETRY AND TRIGONOMETRY
Question 1
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Given
cos
(
x
+
y
)
=
1
4
\cos(x+y) = \frac{1}{4}
cos
(
x
+
y
)
=
4
1
and
cos
(
x
−
y
)
=
3
4
\cos(x-y) = \frac{3}{4}
cos
(
x
−
y
)
=
4
3
, what is the value of
cos
(
x
)
cos
(
y
)
\cos(x)\cos(y)
cos
(
x
)
cos
(
y
)
?
A
1
8
\frac{1}{8}
8
1
B
1
4
\frac{1}{4}
4
1
C
1
2
\frac{1}{2}
2
1
D
1
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