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Byju's Answer
Standard XII
Mathematics
Coordinates of a Point in Space
Show that the...
Question
Show that the vector
i
^
+
j
^
+
k
^
is equally inclined to the coordinate axes.
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Solution
Let
θ
1
be the angle between
a
→
and
x
-
axis.
a
→
=
1
2
+
1
2
+
1
2
=
3
b
→
=
i
∧
(Because
i
∧
is the unit vector along
x
-axis)
b
→
=
1
2
=
1
=
1
a
→
.
b
→
=
1
+
0
+
0
=
1
cos
θ
1
=
a
→
.
b
→
a
→
b
→
=
1
3
1
=
1
3
⇒
θ
1
=
cos
-
1
1
3
.
.
.
1
Let
θ
2
be the angle between
a
→
and
y
-
axis.
a
→
=
1
2
+
1
2
+
1
2
=
3
b
→
=
j
∧
(Because
j
∧
is the unit vector along
y
-axis)
b
→
=
1
2
=
1
=
1
a
→
.
b
→
=
0
+
1
+
0
=
1
cos
θ
2
=
a
→
.
b
→
a
→
b
→
=
1
3
1
=
1
3
⇒
θ
2
=
cos
-
1
1
3
.
.
.
2
Let
θ
3
be the angle between
a
→
and
z
-
axis.
a
→
=
1
2
+
1
2
+
1
2
=
3
b
→
=
k
∧
(Because
k
∧
is the unit vector along
z
-axis)
b
→
=
1
2
=
1
=
1
a
→
.
b
→
=
0
+
0
+
1
=
1
cos
θ
=
a
→
.
b
→
a
→
b
→
=
1
3
1
=
1
3
⇒
θ
=
cos
-
1
1
3
.
.
.
3
From (1), (2) and (3), the given vector is equally inclined to the coordinate axes.
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0
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Q.
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