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Byju's Answer
Standard VII
Mathematics
Incentre and Its Construction
In a ABC , a,...
Question
In a
△
A
B
C
,
a
,
b
,
c
are the sides of the triangle opposite to the angles
A
,
B
,
C
respectively. If
b
+
c
=
3
a
,
then
cot
B
2
⋅
cot
C
2
has the value equal to
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Solution
cot
B
2
⋅
cot
C
2
=
s
(
s
−
b
)
Δ
⋅
s
(
s
−
c
)
Δ
=
s
(
s
−
b
)
Δ
⋅
s
(
s
−
c
)
Δ
⋅
s
−
a
s
−
a
=
s
⋅
△
2
△
2
⋅
(
s
−
a
)
=
s
s
−
a
=
2
s
2
s
−
2
a
But given that
a
+
b
+
c
=
4
a
⇒
2
s
=
4
a
Hence,
cot
B
2
⋅
cot
C
2
=
4
a
2
a
=
2
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Similar questions
Q.
In
Δ
A
B
C
the sides opposite to angles
A
,
B
,
C
are denoted by
a
,
b
,
c
respectively.
If
b
+
c
=
3
a
then
cot
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2
⋅
cot
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2
has the value equal to?
Q.
In a
△
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, a,b and c are the side of the triangle opposite to the angles
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,
B
,
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Q.
If
a
,
b
,
c
are the sides opposite to angles
A
,
B
,
C
of a triangle
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B
C
,
respectively and
∠
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In
△
A
B
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,
sides opposite to angles
A
,
B
,
C
are denoted by
a
,
b
,
c
respectively. Then the value of
a
cos
A
+
b
cos
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+
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In
△
A
B
C
,
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A
,
B
,
C
are denoted by
a
,
b
,
c
respectively. Then the value of
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b
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sin
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