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Byju's Answer
Standard XII
Mathematics
Sin(A+B)Sin(A-B)
If tan θ =1...
Question
If tan
θ
=
1
2
and
t
a
n
ϕ
=
1
3
, then the value of
θ
+
ϕ
is
A
π
6
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B
π
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C
π
4
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D
0
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Solution
The correct option is
B
π
4
tan
θ
=
1
2
,
tan
ϕ
=
1
3
tan
(
θ
+
ϕ
)
=
tan
θ
+
tan
ϕ
1
−
tan
θ
tan
ϕ
=
1
2
+
1
3
1
−
(
1
2
)
(
1
3
)
=
5
6
5
6
∴
tan
(
θ
+
ϕ
)
=
1
⇒
θ
+
ϕ
=
π
4
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0
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