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Byju's Answer
Standard XII
Mathematics
Circular Measurement of Angle
Prove that ...
Question
Prove that
c
o
s
A
−
s
i
n
A
+
1
c
o
s
A
+
s
i
n
A
−
1
=
c
o
s
e
c
A
+
c
o
t
A
.
Open in App
Solution
LHS
=
c
o
s
A
−
s
i
n
A
+
1
c
o
s
A
+
s
i
n
A
−
1
dividing Nr and Dr by
s
i
n
A
we get,
=
c
o
s
A
s
i
n
A
−
s
i
n
A
s
i
n
A
+
1
s
i
n
A
c
o
s
A
s
i
n
A
+
s
i
n
A
s
i
n
A
−
1
s
i
n
A
=
c
o
t
A
−
1
+
c
o
s
e
c
A
c
o
t
A
+
1
−
c
o
s
e
c
A
=
c
o
t
A
+
c
o
s
e
c
A
−
(
c
o
s
e
c
2
A
−
c
o
t
2
A
)
c
o
t
A
+
1
−
c
o
s
e
c
A
=
(
c
o
t
A
+
c
o
s
e
c
A
)
(
1
−
c
o
s
e
c
A
+
c
o
t
A
)
c
o
t
A
+
1
−
c
o
s
e
c
A
=
c
o
t
A
+
c
o
s
e
c
A
=
RHS
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121
Similar questions
Q.
Prove:
c
o
s
A
−
s
i
n
A
+
1
c
o
s
A
+
s
i
n
A
−
1
=
1
c
o
s
e
c
A
−
c
o
t
A
Q.
Prove:
c
o
t
A
+
c
o
s
e
c
A
−
1
c
o
t
A
−
c
o
s
e
c
A
+
1
=
1
+
c
o
s
A
s
i
n
A
=
c
o
s
e
c
θ
+
c
o
t
θ
=
s
i
n
A
1
−
c
o
s
A
Q.
Prove that :
cos
A
−
sin
A
+
1
cos
A
+
sin
A
−
1
=
cos
e
c
A
+
cot
A
Q.
Prove that
s
i
n
A
1
−
c
o
s
A
=
c
o
s
e
c
A
+
c
o
t
A
Q.
Cosa-sina+1/cosa+sina-1=coseca+cota=using the identity cosec2a=1+cot2a
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