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Byju's Answer
Standard XIII
Mathematics
Trigonometric Ratios for Sum of Two Angles
If cosα+β=35,...
Question
If
cos
(
α
+
β
)
=
3
5
,
sin
(
α
−
β
)
=
5
13
and
0
<
α
,
β
<
π
4
,
then
tan
(
2
α
)
is equal to:
A
21
16
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B
63
16
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C
63
52
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D
33
52
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Solution
The correct option is
B
63
16
cos
(
α
+
β
)
=
3
5
⇒
tan
(
α
+
β
)
=
4
3
sin
(
α
−
β
)
=
5
13
⇒
tan
(
α
−
β
)
=
5
12
Now,
⇒
tan
(
2
α
)
=
tan
(
(
α
+
β
)
+
(
α
−
β
)
)
=
tan
(
α
+
β
)
+
tan
(
α
−
β
)
1
−
tan
(
α
+
β
)
⋅
tan
(
α
−
β
)
=
4
3
+
5
12
1
−
4
3
×
5
12
=
63
16
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0
Similar questions
Q.
If
cos
(
α
+
β
)
=
3
5
,
sin
(
α
−
β
)
=
5
13
and
0
<
α
,
β
<
π
4
,
then
tan
(
2
α
)
is equal to:
Q.
If
0
<
α
,
β
<
π
4
,
cos
(
α
+
β
)
=
4
5
,
sin
(
α
−
β
)
=
5
13
, then
tan
2
α
=
Q.
Let
cos
(
α
+
β
)
=
4
5
and
sin
(
α
−
β
)
=
5
13
, where
0
≤
α
,
β
≤
π
4
, then
tan
2
α
is equal to
Q.
If
cos
(
α
+
β
)
=
4
5
,
sin
(
α
−
β
)
=
5
13
and
α
,
β
lie between 0 and
π
4
, then
tan
2
α
=
Q.
If
cos
(
α
+
β
)
=
4
/
5
,
sin
(
α
−
β
)
=
5
/
13
and
α
,
β
lie between
0
and
π
4
, find
tan
2
α
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Standard XIII Mathematics
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