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Standard X
Mathematics
Visualisation of Trigonometric Ratios Using a Unit Circle
If cos B /sin...
Question
If
c
o
s
B
s
i
n
A
=
n
a
n
d
c
o
s
B
c
o
s
A
=
m
,
then show that
(
m
2
+
n
2
)
c
o
s
2
A
=
n
2
.
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Solution
n
=
c
o
s
B
s
i
n
A
;
m
=
c
o
s
B
c
o
s
A
So,
n
2
=
c
o
s
2
B
s
i
n
2
A
;
m
2
=
c
o
s
2
B
c
o
s
2
A
L
.
H
.
S
.
=
(
m
2
+
n
2
)
c
o
s
2
A
=
(
c
o
s
2
B
c
o
s
2
A
+
c
o
s
2
B
s
i
n
2
A
)
c
o
s
2
A
=
s
i
n
2
A
c
o
s
2
B
+
c
o
s
2
A
c
o
s
2
B
c
o
s
2
A
s
i
n
2
A
×
c
o
s
2
A
=
c
o
s
2
B
(
s
i
n
2
A
+
c
o
s
2
A
)
s
i
n
2
A
=
c
o
s
2
B
s
i
n
2
A
=
n
2
=
R
.
H
.
S
.
Hence Proved.
Suggest Corrections
1
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Q.
If
c
o
s
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/
s
i
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A
=
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and
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Q.
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