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Byju's Answer
Standard XII
Mathematics
Trigonometric Equations
If cos-1x+c...
Question
If
cos
−
1
x
+
cos
−
1
y
+
cos
−
1
z
=
3
π
then the value of
x
y
+
y
z
+
z
x
is
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Solution
If
x
=
y
=
z
=
−
1
then
cos
−
1
(
−
1
)
+
cos
−
1
(
−
1
)
+
cos
−
1
(
−
1
)
=
3
π
The value of
x
y
+
y
z
+
z
x
=
(
−
1
)
(
−
1
)
+
(
−
1
)
(
−
1
)
+
(
−
1
)
(
−
1
)
=
3
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0
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