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EAMCET Engineering 2009 Solved Paper
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© examsnet.com
Question : 103
Total: 160
cos
x
cos
(
x
−
2
y
)
=
λ
⇒
tan
(
x
−
y
)
tan
y
is equal to
1
+
λ
1
−
λ
1
−
λ
1
+
λ
λ
1
+
λ
λ
1
−
λ
Validate
Solution:
Now,
tan
(
x
−
y
)
tan
y
=
s
i
n
(
x
−
y
)
s
i
n
y
cos
(
x
−
y
)
cos
y
×
2
2
=
cos
(
x
−
2
y
)
−
cos
(
x
)
cos
(
x
−
2
y
)
+
cos
(
x
)
=
1
−
cos
x
cos
(
x
−
2
y
)
1
+
cos
(
x
)
cos
(
x
−
2
y
)
=
1
−
λ
1
+
λ
(
Given,
λ
=
cos
x
cos
(
x
−
2
y
)
)
© examsnet.com
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