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Byju's Answer
Standard XII
Mathematics
Sin(A+B)Sin(A-B)
If α+β=π4 t...
Question
If
α
+
β
=
π
4
the prove that
(
1
+
t
a
n
α
)
(
1
+
t
a
n
β
)
=
2
Open in App
Solution
Given:
α
+
β
=
π
4
tan
(
α
+
β
)
=
tan
π
4
tan
α
+
tan
β
1
−
tan
α
tan
β
=
1
⇒
tan
α
+
tan
β
=
1
−
tan
α
tan
β
⇒
tan
α
+
tan
β
+
tan
α
tan
β
=
1
⇒
tan
α
+
tan
β
+
tan
α
tan
β
=
1
by adding
1
to both sides.
⇒
1
+
t
a
n
α
+
tan
β
+
tan
α
tan
β
=
1
+
1
⇒
(
1
+
t
a
n
α
)
+
tan
β
(
1
+
tan
β
)
=
1
+
1
∴
(
1
+
t
a
n
α
)
(
1
+
t
a
n
β
)
=
2
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Standard XII Mathematics
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