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Byju's Answer
Standard XII
Physics
Fringe Width in YDSE
If in Δ AB...
Question
If in
Δ
A
B
C
,
A
C
is double of
A
B
, then the value of
cot
A
2
.
cot
B
−
C
2
is equal to
A
1
3
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B
−
1
3
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C
3
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D
1
2
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Solution
The correct option is
C
3
Given
b
=
2
c
∴
cot
A
2
.
cot
B
−
C
2
=
b
+
c
b
−
c
=
2
c
+
c
2
c
−
c
=
3
using above formula.
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