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Byju's Answer
Standard XII
Mathematics
Trigonometric Ratios Using Right Angled Triangle
2) If the roo...
Question
2) If the roots of the quadratic equation :
x
2
+
A
x
+
B
=
0
a
r
e
tan
30
°
a
n
d
tan
15
°
t
h
e
n
t
h
e
v
a
l
u
e
o
f
A
-
B
=
—
(
a
)
1
(
b
)
-
1
(
c
)
2
(
d
)
3
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Solution
Dear Student,
The
given
quadratic
equation
is
,
x
2
+
Ax
+
B
=
0
Now
,
tan
30
and
tan
15
are
the
roots
of
the
above
equation
.
Now
,
tan
30
+
tan
15
=
-
A
.
.
.
.
1
tan
30
.
tan
15
=
B
.
.
.
.
.
2
Adding
1
and
2
,
we
get
tan
30
+
tan
15
+
tan
30
.
tan
15
=
-
A
+
B
.
.
.
.
.
3
Now
,
tan
45
=
tan
30
+
15
⇒
1
=
tan
30
+
tan
15
1
-
tan
30
.
tan
15
⇒
1
-
tan
30
.
tan
15
=
tan
30
+
tan
15
⇒
tan
30
+
tan
15
+
tan
30
.
tan
15
=
1
Now
,
from
3
,
we
get
1
=
-
A
+
B
⇒
A
-
B
=
-
1
Regards.
Suggest Corrections
0
Similar questions
Q.
If
tan
A
,
tan
B
are the roots of quadratic equation
a
x
2
+
3
x
+
4
=
0
,
a
≠
0
and
tan
A
cot
B
−
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A
=
1
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, then the value of
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Q.
If the roots of the quadratic equation
x
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+
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∘
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If the roots of the quadratic equation
x
2
+
p
x
+
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=
0
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∘
and
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a
n
15
∘
, respectively, then the value of
2
+
q
−
p
is :
Q.
If the roots of the quadratic equation
x
2
+
p
x
+
q
=
0
are tan
30
∘
and tan
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∘
, respectively, then value of 2 + q - p is
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If
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